These Fudgy Buckeye Brownies are made with 3 irresistible layers - rich chocolate brownie, creamy peanut butter fudge, and silky chocolate ganache. Easy to make from scratch or with a box mix!
You might also like No Bake Chocolate Peanut Butter Cake and Chocolate Ganache Tart next.
If you love the chocolate and peanut butter combination of a classic buckeye candy, these fudgy buckeye brownies are about to become your new obsession. Three irresistible layers - a rich, dense brownie base made with Dutch-process cocoa, a thick and creamy peanut butter fudge filling, and a silky smooth chocolate ganache on top - all in one pan.
Inspired by the classic Ohio Buckeye candy, these brownies deliver that iconic sweet-and-salty peanut butter-chocolate combo in a bar you can slice and serve for any occasion.
They taste like a cross between a Reese's peanut butter cup and a fudgy brownie, but with a filling that actually holds its shape when you slice. Make them from scratch in under an hour of active time, or use your favorite box mix for an easy shortcut. Either way, these are the brownies people ask you to bring to every party.
Love Brownies? Try Brownie Stuffed Cookies, Espresso Mousse Brownies and Raspberry Mousse Brownies next.
Why You'll Love This Recipe
- Rich, Chocolate-Peanut Butter Flavor: Buckeye brownies combine chewy chocolate brownie, creamy peanut butter fudge, and a glossy chocolate topping for an indulgent treat.
- Perfect Contrast: It's all about the play between sweet and salty: chocolate brings sweetness and a little bitterness; while peanut butter adds saltiness and smoothness. Together they heighten and contrast each other making the overall taste better and more intense.
- Easy for Any Skill Level: Beginner-friendly steps mean you don't need special tools or advanced techniques-just simple instructions for perfect results.
What is a Buckeye?
Buckeye is a small, shiny, dark brown nut with a light tan patch that originated from Ohio (aka Buckeye state). According to folklore, the Buckeye resembles the eye of a deer (please examine the Buckeye brownie for yourself!).
Buckeye brownies take that same winning flavor combination and transform it into a sliceable bar. Instead of individual candies, you get three distinct layers stacked in one pan. Every bite delivers the same chocolate-to-peanut-butter ratio that makes buckeye candies so addictive - just in a format that's easier to make in large batches and perfect for sharing.
Essential Ingredients
- Eggs: Adding two large eggs to a brownie batter can creates a fudgier texture because egg yolks are full of fat which adds richness and a tender texture; while whites hold everything together, helping the brownies set.
- Butter: Note that the butter in this buckeye brownies recipe is divided between the peanut butter and chocolate layers. You'll need 2 ½ sticks of butter in total.
- Dutch Process cocoa powder: For a richer, more intense chocolate flavor.
- Creamy Peanut Butter: Use regular creamy peanut butter (like Jif or Skippy), not natural peanut butter. Natural peanut butter is too oily and the layer won't hold its shape. Crunchy peanut butter can be used but it's a lot thicker and drier, and therefore will end up drying out the Buckeye brownies. If you're a peanut butter and chocolate fan, Monster Cookie Bars belong on your list too.
- Sugar: There are 2 cups of sugar in the Buckeye brownies (both granulated and powdered). It sounds like a lot, but remember that you are using unsweetened cocoa powder which does not contain the extra sugar. Also, sugar does much more than sweeten brownies. It liquifies as they bake, creating a softer center.
- Confectioners' sugar: The extra-fine texture of confectioners' sugar is ideal for mixing into the peanut butter and keeping the nutty layer smooth and creamy.
- Chocolate chips: I recommend dark or semisweet chocolate -both deliver rich chocolate flavor without being overly sweet. After all, these buckeye brownie bars have plenty of sweetness in the brownie and peanut butter layers.
How to Make Buckeye Brownies
This is an overview with step-by-step photos. Full ingredients, measurements & instructions are in the recipe card below.
1. Make the Brownie Base
Prepare your brownie batter and spread it evenly into a parchment-lined 9×13 inch pan. The parchment is non-negotiable - leave overhang on both sides so you can lift the entire slab out cleanly before slicing. I used the same parchment paper trick in Salted Caramel Frosted Cookies.
Don't overbake the brownie layer. Pull it out when a toothpick shows moist crumbs, not a clean pick - it will continue to set as it cools and needs to stay fudgy enough to hold up to the layers on top.
2. Bake and cool
Let the brownie base cool completely before adding the peanut butter layer. Even slightly warm brownies will melt and collapse the filling.
3. Make Peanut Butter Layer
Beat together the peanut butter, softened butter, and powdered sugar until the mixture is thick, smooth, and spreadable - similar to the consistency of soft cookie dough. Spread it in an even layer over the fully cooled brownie base.
Chill this layer for 20-30 minutes in the fridge before adding the ganache. Skipping this step is the #1 reason layers bleed into each other.
4. Spread and chill
Spread evenly over the cooled brownie base using an offset spatula. Chill in the refrigerator for 15-30 minutes.
5. Make the Chocolate Ganache
Heat cream in a small saucepan or in the microwave until just simmering (not boiling). Pour over the chocolate in a heatproof bowl and let sit for 1-2 minutes.
Stir gently until smooth and glossy. Add butter and a pinch of salt if using.
Melt your chocolate chips and butter (or heavy cream) together until completely smooth and glossy. Pour it over the chilled peanut butter layer and tilt the pan gently to spread it edge to edge.
For a thicker ganache topping, use a 1:1 ratio of chocolate chips to heavy cream. For a thinner, shinier finish, increase the cream slightly.
6. Cool the Ganache and Pour
Let the ganache cool for 5-10 minutes, then pour over the chilled peanut butter layer and spread evenly.
Once poured, do not spread the ganache with a spatula - just tilt the pan. Spreading drags up the peanut butter layer and ruins the clean separation
7. Chill the Brownies and Slice
Chill buckeye brownies for at least 1 hour until all 3 layers are set and then slice into squares.
Fudgy Buckeye Brownies
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Equipment
- 8x8 square baking pan
Ingredients
Brownie Base
- ½ cup dark chocolate chopped
- 10 tablespoon unsalted butter
- 1 ¼ cup light brown sugar packed
- 2 large eggs room temperature
- 1 teaspoon vanilla extract
- ½ cup cocoa powder use 60-70% cocoa, Dutch processed preferred
- ½ cup all-purpose flour
- ½ tsp salt
Peanut Butter Layer
- 1 cup creamy peanut butter (not natural-style)
- ½ cup unsalted butter softened
- 2 cups powdered sugar sifted
- 1 teaspoon vanilla extract
- pinch salt (optional, depending on peanut butter)
Chocolate Ganache Topping
- 1 cup semi-sweet chocolate chips or chopped chocolate (about 6 ounces)
- ½ cup heavy cream
- 1 tablespoon unsalted butter (optional, for shine)
- pinch salt (optional)
Instructions
Brownie Base
- Preheat the oven to 325°F (163°C). Line an 8×8 or 9×9-inch pan with parchment paper.
- Melt the butter and chopped chocolate together over low heat or in short microwave bursts. Stir until smooth.
- Add granulated and brown sugar and stir until glossy. Then whisk in the eggs and vanilla until thickened.
- Sift in flour, cocoa powder, salt, and stir just until combined, don't overmix.
- Spread batter into the prepared pan and smooth the top.
- Bake for 45-55 minutes or until a toothpick inserted into the center comes out with moist crumbs. Let cool completely in the pan before adding layers.
🤎Shortcut alert!🤎
- You can use your favorite brownie box mix instead of making the entire thing from scratch 🫠. Just make sure to add 2 eggs for extra moist brownie batter; and then all you have to do is work on the super simple peanut butter layer and the ganache! 🤎
Peanut Butter Layer
- In a mixing bowl, beat peanut butter and softened butter together until smooth and fluffy.
- Mix in vanilla and salt (if using), then gradually beat in the powdered sugar until thick and spreadable.
- Spread evenly over the cooled brownie base using an offset spatula. Chill in the refrigerator for 15-30 minutes.
Chocolate Ganache
- Heat cream in a small saucepan or in the microwave until just simmering (not boiling). Pour over the chocolate in a heatproof bowl and let sit for 1-2 minutes.
- Stir gently until smooth and glossy. Add butter and a pinch of salt if using.
- Let the ganache cool for 5-10 minutes, then pour over the chilled peanut butter layer and spread evenly. Chill for at least 1 hour until set.
- Slice and serve!
Pro Tips for Success
- Don't skip chilling the peanut butter layer - 20-30 minutes minimum or it will mix into the ganache
- Let ganache cool 5-10 minutes before pouring or it will melt the peanut butter layer
- Hot knife for clean cuts: For picture-perfect squares, run your knife under hot water, dry it off, and slice through the brownie, wiping between cuts.
- Use room-temperature eggs for a smoother batter
- For clean slices, use a warm knife wiped between each cut
- Use parchment paper with overhanging edges (a "sling") for easy removal
- For a thinner brownie base, use a 9×13 pan - great for parties.
- Make ahead tip: Brownies can be made 2 days ahead, stored covered in the fridge; add ganache the day of serving
- Cut into 24 small squares - these are rich and a small square goes a long way
Ingredient Swaps and Substitutions
- Butter: Salted butter is recommended, but unsalted can be used-just add a pinch of salt to each layer for flavor balance.
- Cocoa powder: Natural is preferred, but Dutch-processed will add depth. Both are suitable for easy buckeye brownies for beginners.
- Peanut butter: Creamy peanut butter works best, though you can use crunchy for extra texture. Avoid "natural" varieties as they may cause dryness or oil separation in the fudge layer.
- Chocolate Chips: Semisweet is best for the ganache topping, but milk or dark chocolate chips can also be used for fun.
Can You Use Boxed Brownie Mix for Buckeye Brownies?
🤎For an easy buckeye brownie shortcut, use your favorite brownie box mix instead of making from scratch! 🫠. Just make sure to add 2 eggs for extra moist brownie batter; and then all you have to do is work on the super simple peanut butter layer and the ganache! 🤎
Why Are My Buckeye Brownies Dry or Crumbly?
Dry buckeye brownies often come from overbaking or using too much flour. For the best texture, check doneness a few minutes before the recipe time ends and use a kitchen scale for flour accuracy.
If your peanut butter layer is dry or crumbly, add milk a teaspoon at a time until it's smooth and spreadable.
Peanut Butter Layer Won't Spread or Is Too Stiff
A stiff, crumbly peanut butter layer usually means there's too much powdered sugar or not enough moisture. Gradually add more milk, mixing after each addition, until the mixture can be easily spread.
Start with creamy peanut butter-using "natural" peanut butter can make the filling dry or oily. If you only have natural, blend thoroughly and adjust with a small amount of extra milk or butter.
Chocolate Topping Cracks or Doesn't Set
Cracking often happens when the topping cools too quickly or the chocolate and butter aren't fully blended. Melt chocolate and butter together in 15-second microwave intervals, stirring until completely smooth. Let the brownies cool before spreading, and allow the topping to set at room temperature for even texture.
Essential Equipment
Square 8x8 Pan: Keep in mind that the larger rectangular pan size (such as 9x13) or larger square pan (9x9) bakes faster than a square pan, resulting in a thinner brownie that's perfect for topping with peanut butter and chocolate layers.
Frequently Asked Questions
- Can I use natural peanut butter? It's not recommended. Natural peanut butter can be too oily or too dry and may cause the layer to separate. Stick to shelf-stable creamy versions for best results. (no and low sugar shelf-stable versions if you prefer)
- What kind of chocolate works best for ganache? Semi-sweet or dark chocolate chips are ideal. You can use chopped bars too, just avoid chocolate with added stabilizers or fillings.
- Can I double the recipe? Yes! Use a 9×13-inch pan and adjust the bake time slightly (add 5-10 minutes) for best results.
Storage and Leftovers
Have leftover brownies? Use them to make my Brownie Stuffed Chocolate Chip Cookies - the best thing you can do with a leftover brownie!
- These brownies keep well refrigerated for up to 5 days. For cleaner slices, cut them cold with a sharp knife and wipe the blade between cuts.
- You can freeze them (before or after slicing) for up to 2 months.
- For fancy serving options, cut the brownies into squares and place them in muffin paper liners for serving on a dessert tray. Makes it easier for potlucks too!
Carol says
So delicious!
Michelle says
I've made chocolate covered peanut butter cups once and decided to do the buckeye brownies today. Came out perfect, the brownie is moist and cakes just like I like it, the peanut butter layer is smooth and bakery like! 10 out of 10!