I bake this chocolate zucchini cake every summer when zucchini starts piling up at my local market in New York. It's fudgy, rich, and stays moist for days thanks to using oil instead of butter. You can't spot the zucchini, and the simple one-bowl batter means I can have it cooling on the counter in under an hour. Top it with ganache and a few chocolate curls and it looks like way more effort than it took.
Whoever said that chocolate cake is not a balanced food has never tried a piece of Chocolate Zucchini Cake. Is it cake? Is it vegetable? This devilishly rich one-layer chocolate cake is so soft and moist, you'd never guess it's packed with zucchini. Who knew Zucchini recipes could be this indulgent?
Recipe Overview
Batter texture: The batter should feel thick and lush, not something you pour in a stream but more like you scoop it into the pan. That's what gives you a crumb that eats more like a brownie than a light, fluffy sponge.
Zucchini role: The zucchini goes in shredded and just disappears as it bakes. You won't see it, but you'll feel it in how moist the cake stays for days. If you squeeze the zucchini dry, the cake comes out firmer and a bit drier-same story with my Zucchini Brownies.
Bake cues: I look for a top that turns matte instead of shiny and a center that still feels slightly springy when I press it. A toothpick should come out with a few moist crumbs, not wet batter. If it's bone dry, it's gone a little too far.
Pan choice: I like using a 9‑inch springform because it gives taller sides and a nice shape. It usually needs a couple extra minutes compared to a regular metal cake pan, so I start checking a bit earlier with the metal pan.
Ganache timing: The ganache needs about 10-15 minutes to thicken before you pour it. When it's ready, it flows slowly over the cooled cake instead of running off the edges and sets into a soft, fudgy layer on top.
Texture over time: On day 1, the cake is soft and clearly cake-like. By day 2, the crumb turns more fudgy and the chocolate flavor deepens, which is my favorite stage for slicing and serving.
Fridge behavior: In the fridge, everything tightens up-the ganache and the crumb go a bit denser and almost truffle-like. I let slices sit at room temperature for 20-30 minutes to bring back that softer, cake-like texture.
Ease factor: This is a true one-bowl situation. I grab a whisk, pull out basic pantry ingredients, mix everything in the same bowl, and never bother with the mixer from start to finish.
Scoopable Batter = Fudgy Cake
The batter for this chocolate zucchini cake should feel thick and lush-more something you scoop into the pan than pour in a steady stream. That texture comes from the shredded zucchini and cocoa working together, and it's what gives you a crumb that's closer to a brownie than a light sponge. The zucchini disappears completely into the crumb as it bakes, so you don't see little green flecks or taste anything vegetal, but you feel the difference in how moist and fudgy the cake stays for days, especially on day two when the crumb settles and the chocolate flavor deepens. If you've ever squeezed the zucchini dry and ended up with a cake that felt a bit firm, you'll notice right away that keeping that moisture in is what gives you that soft, melt‑in‑the‑mouth texture.
Ganache, Bake Cues, and Pan Choice
The ganache is where the cake starts looking bakery‑style. I heat the cream, pour it over chopped chocolate, and let it sit until it thickens in about 10-15 minutes before pouring-this timing matters so it flows slowly over the cooled cake instead of running right off the sides. Once it sets, the top looks matte, not shiny, with a soft fudgy finish that shifts slightly in the fridge: it firms up when chilled, then loosens back into a smooth, sliceable layer as it comes to room temperature. I notice the cake feels a bit denser and truffle‑like straight from the fridge, and more cake‑like once it warms up again. Using a springform pan gives taller sides and a slightly longer bake time than a regular metal pan, and there's that moment near the end where the cake looks set but the center still has a gentle jiggle-that's when I start checking for moist crumbs on the toothpick instead of waiting for it to come out completely clean. The whole thing comes together in one bowl with a whisk, no mixer needed, which makes it easy to slide in between everything else happening in the kitchen.
Chocolate Zucchini Cake Ingredients
Zucchini: It doesn't bring much flavor, but it adds moisture, texture, and a bit of fiber, which is exactly what keeps the cake soft and fudgy instead of dry. I grate it on the fine side so it melts right into the batter.
Unsweetened Cocoa Powder: I prefer Dutch‑processed cocoa for this cake because the flavor is smoother and more chocolate‑forward, and it makes the crumb noticeably darker. It mixes in easily with the flour, so you don't end up with streaks of dry cocoa hiding in the batter. If you only have natural cocoa, you can still use it-the color will be lighter and the flavor a touch sharper.
Oil: Oil is what keeps this cake moist for days, even after a night in the fridge. I usually use canola because it's neutral, but a mild olive oil works too if you like a slightly deeper flavor. If you swap in butter, the cake will still be good, just a bit less bouncy and not quite as moist over time.
All‑Purpose Flour: I use regular unbleached all‑purpose flour. It keeps the texture tender without bringing any extra flavor to distract from the chocolate. Bleached flour also works if that's what you have, but I stick with unbleached so the crumb stays a little more "clean" tasting.
Baking Soda, Baking Powder, and Salt: These three quietly handle lift and balance. Baking soda and baking powder help the thick batter rise so the cake doesn't feel heavy, and the salt sharpens the chocolate flavor and keeps the sweetness in check.
Brown Sugar: Brown sugar adds moisture and a gentle caramel note that fits really well with chocolate. It helps create that soft, plush crumb. If you only have white sugar, you can use it, but the cake will be a bit lighter in flavor and slightly less moist.
Eggs: I use large eggs at room temperature so they mix smoothly into the batter and help everything bind together without overworking the flour. Cold eggs can make the batter thicker and a little uneven, so I like to pull them out ahead of time.
Chocolate for Topping: A square of bittersweet chocolate shaved into curls over the ganache gives a little texture and an extra hit of chocolate. It's optional but makes the cake look finished and adds a nice contrast between the smooth ganache and the little curls on top.
Ingredient Swaps & Substitutions
Zucchini
If you're short on zucchini, you can make up the difference with finely grated carrot, but the texture and flavor will shift a little more toward a classic carrot cake. I don't recommend swapping zucchini out entirely for another vegetable if you want that very fudgy, moist crumb.
Cocoa Powder
This cake is best with Dutch‑processed cocoa, but if you only have natural cocoa, you can still use it. The color will be lighter and the flavor a bit more intense. If you make the swap, taste the batter and adjust the sugar slightly if you want to round out the sharper cocoa note.
Oil
Any neutral‑tasting oil like canola, vegetable, or grapeseed works well. A mild olive oil is fine too and can add a subtle depth. I wouldn't use a strong-flavored oil (like extra‑virgin olive oil or coconut oil) unless you're happy for that flavor to show up in the finished cake.
Flour
Regular all‑purpose flour is my go‑to. You can swap in a 1:1 gluten‑free baking blend if needed; just expect the texture to be a little more delicate. I don't recommend using only whole wheat flour because it can make the cake denser and less soft.
Sugar
This recipe is written for brown sugar because it brings moisture and a hint of caramel flavor. If you only have white sugar, you can use it, but the crumb will be a touch drier and the flavor less rounded. A mix of half brown and half white is a good compromise.
Eggs
For a vegan version, you can replace the eggs with flax eggs (ground flaxseed mixed with water until it gels). The cake will be slightly denser but still moist. Make sure to pair this with plant‑based milk and dairy‑free chocolate for the ganache.
Chocolate & Ganache: Bittersweet chocolate gives you a rich ganache and topping without being overwhelmingly sweet. You can use semi‑sweet if that's what you have; the cake will just lean more toward a classic sweet chocolate flavor. For dairy‑free, swap the cream for full‑fat coconut milk and use dairy‑free chocolate chips.
Ganache ingredients
- Bitter Sweet Chocolate Chips: bittersweet chocolate, chopped.
- Heavy Whipping Cream
How to make chocolate zucchini cake
Making this cake is much easier than it looks! Simply shred some zucchini, mix up the cake batter, and bake the cake inside 9-inch spring form pan. Then make the chocolate ganache and once the cake cools, pour the ganache all over the cake for shiny finish.
1. Make the Chocolate Cake
- Mix dry ingredients: Whisk together the flour, sifted cocoa powder, baking soda, baking powder, and salt.
- Mix liquid ingredients: Next add the eggs and brown sugar. Beat together until slightly frothy and well combined. Add the oil, vanilla extract, and milk, whisk to combine.
2. Add zucchini
Stir in the shredded zucchini.
4. Combine everything together
Add the dry ingredients to the wet ingredients and gently fold everything together until only just combined.
5. Add chopped chocolate
If you're using chocolate chips or chopped chocolate, stir them in now.
6. Bake the cake
- Pour the batter into the prepared pan and smooth the top.
- Bake zucchini cake for 35-40 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs. Leave to cool in the pan.
7. Make the ganache
Make ganache by pouring hot (not boiling) microwaved cream over chocolate chips, covering for 1-2 minutes, then whisking until smooth. Let it thicken for 10-15 minutes, pour over the cake, and allow it to set for 2 hours at room temperature or 1 hour in the fridge before serving.
8. Cool and pour
Let the ganache sit for 10-15 minutes to thicken slightly, then pour it over the cooled cake and spread to the edges with an offset spatula or back of a spoon.
The ganache should cover the entire surface of the cake and it will set to a soft, glossy finish.
9. Top with shaved chocolate
Use a vegetable peeler to make some chocolate curls and scatter them over the top of the cake.
Chocolate Zucchini Cake with 2-Ingredient Chocolate Ganache
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Equipment
- 9 inch springform pan
Ingredients
Cake
- 1 cup all-purpose flour
- ½ cup unsweetened cocoa powder sifted
- 1 teaspoon baking soda
- ½ teaspoon baking powder
- ¼ teaspoon salt
- 1 cup light brown sugar
- 2 large eggs at room temperature
- ½ cup neutral oil (vegetable or canola oil)
- 1 teaspoon vanilla extract
- 1½ cups shredded zucchini (no need to peel; lightly packed, not squeezed)
- ¼ cup milk (dairy or plant-based like almond or oat)
- ½ cup bittersweet chocolate chips or chopped chocolate optional for extra richness
Ganache
- 6 oz semi sweet chocolate chips
- ¾ cup heavy whipping cream
Topping
- 1 square bittersweet chocolate shaved into curls
Instructions
- Preheat your oven to 350°F. Grease a 9-inch round springform cake pan and line the base with parchment paper.
- In a large bowl, whisk together the flour, sifted cocoa powder, baking soda, baking powder, and salt.
- In a separate bowl, add the eggs and brown sugar. Beat together until slightly frothy and well combined. Add the oil, vanilla extract, and milk, whisk to combine then stir in the shredded zucchini.
- Add the dry ingredients to the wet ingredients and gently fold everything together until only just combined. If you're using chocolate chips or chopped chocolate, stir them in now.
- Pour the batter into the prepared pan and smooth the top. Bake for 35-40 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs. Leave to cool in the pan.
Make the ganache
- Place the chocolate chips in a medium bowl.
- Microwave the cream until it is just starting to simmer, but do not boil it, about 1-1 ½ minutes.
- Pour the hot cream over the chocolate chips, place a plate on top, and let it sit for 1-2 minutes. Then use a whisk to stir it together. It may take a few minutes, just keep stirring.
Pour over the Cake
- Let the ganache sit for 10-15 minutes to thicken slightly, then pour it over the cooled cake and spread to the edges with an offset spatula or back of a spoon. It will set to a soft, glossy finish.
- Use a vegetable peeler to make some chocolate curls and scatter them over the top of the cake.
- Slice, serve and enjoy!
Notes
- Ovens vary a lot. If your cake regularly domes or dries out, try lowering your oven temperature by 25°F and baking a few minutes longer, checking early for moist crumbs on the toothpick.
- A springform pan will leak a little if the seal isn't tight, so I like to set it on a baking sheet to catch any drips and make it easier to move in and out of the oven.
- For cleaner ganache slices, chill the cake until the ganache is firm, then use a warm knife (run under hot water and dried) to cut neat slices without dragging the topping.
- The cake tastes more chocolatey on day two. If you're serving guests, bake it the day before, store it covered in the fridge, and bring it back to room temperature before slicing.
- This recipe works well as cupcakes: fill liners about ⅔ full, bake for less time (start checking around 18-20 minutes), and spoon ganache on top once they're completely cool.
Tips for a Moist Chocolate Cake
Room Temperature Ingredients
I get better results when everything is at roughly the same temperature, especially the eggs. When they're cold, the batter can turn thick and a bit uneven, which makes it harder to bake the cake evenly. Letting eggs and milk sit out for a little while helps them blend smoothly into the oil and sugar so the crumb ends up soft instead of patchy or tough.
Don't Overbake
This cake goes from perfectly moist to slightly dry faster than you'd think, so I start checking early. I look for a top that's matte, not shiny, and a center that springs back gently when pressed. A toothpick should come out with moist crumbs, not wet batter and not completely clean. If it's bone dry, it's had a few minutes too long in the oven.
Why Oil Makes a Difference
I use oil instead of butter here because it keeps the cake moist for days, even after it's been in the fridge. Butter-based cakes are lovely, but they can firm up more as they cool. With oil, the crumb stays soft and a little bouncy, and the texture leans more toward a fudgy chocolate cake than a light sponge.
Ganache Guide
Classic 2‑Ingredient Ganache
I keep the ganache simple: just cream and chopped chocolate. I heat the cream until it's hot but not boiling, pour it over the chocolate, and let it sit for a minute or two. After a quick stir, it turns smooth and glossy. I give it 10-15 minutes to thicken before pouring so it flows slowly over the cooled cake instead of running straight off the edges.
Coconut Oil Option
When I want a lighter take, I swap the cream for coconut oil. It makes a slightly thinner ganache that firms up nicely once chilled and has a gentle coconut note. Refined coconut oil keeps the flavor more neutral, while unrefined will give you a bit more coconut coming through in each bite.
Variations and Add‑Ins
Nuts, Sea Salt, or Ice Cream
I like keeping the base recipe simple, then dressing it up depending on who I'm serving. Toasted nuts scattered over the ganache add crunch, and a pinch of flaky sea salt on top gives that sweet‑salty contrast. For serving, a scoop of vanilla ice cream or a dollop of lightly sweetened whipped cream turns a plain slice into a plated dessert.
How to Make It Vegan
To make the cake vegan, I swap the eggs for flax eggs and use plant‑based milk. For the ganache, I use dairy‑free chocolate and full‑fat coconut milk or another rich plant‑based cream. The texture is a little denser than the original, but it still lands in that soft, fudgy zone that makes this recipe so satisfying.
Storage, Freezing, and Make Ahead
This cake has a lot of moisture, so I store it in the fridge rather than on the counter. Once the ganache has set, I cover the cake well so it doesn't dry out. The crumb and ganache tighten up when chilled and take on a more truffle‑like feel; letting slices sit at room temperature for 20-30 minutes brings back that softer, cake‑like texture. For freezing, I slice the cake, wrap each piece, and then tuck them into an airtight container. They thaw well at room temperature and are easy to pull out when you need a quick dessert.
No. The zucchini blends completely into the crumb, so what you taste is chocolate, not vegetables.
I don't peel it. The skin is thin and softens as it bakes, and it's easier to grate with the peel on.
I don't squeeze it for this recipe. The extra moisture is important for keeping the cake soft and fudgy. Squeezing it dry will make the crumb firmer and less moist.
A 9‑inch round pan is ideal, but you can use a similar‑sized square pan if that's what you have. Just start checking doneness a little earlier and keep an eye on the edges.
Yes. I actually like it even more the next day, when the flavors settle and the texture turns a bit more fudgy. Just store it in the fridge and let it sit out before serving.
More Chocolate & Zucchini Recipes from My Kitchen
Over time, these have turned into the recipes my readers and I cycle through when we're in the mood for something chocolatey or trying to keep up with zucchini season.
- Chocolate Strawberry Cake - a rich chocolate base with fresh strawberries that I love making when berries are everywhere in New York.
- Chocolate Mousse Brownies - dense brownies topped with a silky mousse layer; my "special occasion but still doable at home" dessert.
- Buckeye Brownies - brownie meets peanut butter fudge, the one friends ask for when they know I'm baking.
And if you're working through a pile of zucchini, these are the recipes that keep it from going to waste:
- Zucchini Brownies - same idea as the cake, but even closer to a fudgy square than a slice of cake.
- Zucchini Carpaccio with Lemon Vinaigrette - thinly sliced zucchini with a bright, lemony dressing that I reach for when I want something light next to all the chocolate.
- Easy Zucchini Soup - simple, cozy, and a nice way to use any zucchini that didn't make it into dessert.
All of these live in the same little corner of my kitchen: recipes I cook when the market is overflowing and I'm trying to balance rich chocolate bakes with lighter ways to use up what's in the pan and in the fridge.
Glenda says
Delicious with yellow zucchini as well!
Kime says
I just finished using this recipe. It is PERFECT!! The cake came out moist, tender and raised beautifully. I stuck the cake in the freezer and going to top with marscapone frosting Saturday for the birthday paty. I can’t wait!!
Maria says
The cake was moist and delicious and I used two cups of zucchini! Glaze was supper easy. I want to try coconut milk next time.
Olya says
Yes - coconut milk will work very well and the glaze will be thicker.