Strawberry Sheet Cake with Freeze-Dried Strawberry Frosting

By Olya Shepard · Baker: Layer Cakes, Cookies & Desserts

This strawberry sheet cake gets its flavor from three forms of strawberry working together: fresh purée in the batter for moisture and natural sweetness, freeze-dried strawberry powder in the frosting for concentrated flavor and structural stability, and strawberry jello powder in both for that brilliant pink color - no artificial food dye. I tested versions with just fresh berries and just jello, and neither delivered the depth this three-layer approach gives. It bakes in a 9×13 pan in 30 minutes, serves 16, and the frosting stays stiff and vibrant even at room temperature.

Three forms of strawberry. That's the secret to this cake.

Fresh strawberry purée goes into the batter. It delivers real fruit flavor and keeps the crumb moist without making the batter soupy - whole berries blended smooth, nothing fancy. Freeze-dried strawberry powder goes into the cream cheese frosting. Fresh berries in frosting = watery, unstable mess that slides off the cake. Freeze-dried = pure strawberry intensity with zero added liquid, so the frosting holds its shape and actually tastes like strawberries rather than just pink butter. And strawberry jello powder goes into both. Not for artificial flavor - it barely contributes any. It's there as a color amplifier and flavor intensifier, keeping the cake pink all the way through the oven and the frosting vibrantly pigmented without a single drop of food dye.

One more thing: I use unbleached flour. Bleached flour is treated with chlorine, and I'd rather leave that out of my baking. Swap it for bleached if that's what you have - the cake will still work.

The result? A proper strawberry cake. Not a pink vanilla cake with a few berries in it. Actual strawberry flavor in every single bite, baked in one pan, done in 30 minutes.

Deep into baking with strawberries? Then explore these 25 Fresh Strawberry Recipes You'll Crave All Year as well as How to Get the Most Flavor Out of Fresh Strawberries in Desserts.

Ingredients for Strawberry Sheet Cake

Cake

• Fresh strawberries - blended into purée for the batter to add real fruit moisture without making the batter wet. Use about 2 cups whole berries to get 1 cup purée. This is your moisture and your flavor. Don't skip it and don't substitute with strawberry extract.
• All-purpose flour - I use unbleached. Bleached flour is treated with chlorine; I'd rather leave it out. Either works, the cake won't taste different, but unbleached is my preference.
• Baking powder + salt - standard lift and balance. Nothing to overthink here.
• Strawberry jello powder - 3 tablespoons into the batter. It's not for artificial flavor - it amplifies the strawberry color so the cake stays pink through the oven. Without it, the purée turns the crumb beige. Also used in this No Bake Strawberry Pie.
• Butter + canola oil - both. Butter for flavor, oil for moisture that stays soft even when the cake is cold. All butter = slightly drier crumb the next day.
• Granulated sugar - also contributes moisture retention in the crumb. Not just sweetness.
• Eggs + vanilla - room temperature eggs. Cold eggs don't incorporate as smoothly.
• Whole milk - the fat content matters here. Skim milk makes a thinner batter.

Cream Cheese Strawberry Frosting

• Freeze-dried strawberries - pulsed to a fine powder in the food processor. This is the move. Fresh strawberries in frosting add too much water and the frosting goes slack. Freeze-dried gives you pure, concentrated strawberry flavor and a frosting that holds its shape at room temperature.
• Cream cheese - softened. Full fat. Don't use low-fat or the frosting won't set properly.
• Unsalted butter - also softened. Beat it with the cream cheese until completely smooth before adding anything else.
• Powdered sugar - gives the frosting its structure and lightness.
• Strawberry jello powder - 2 teaspoons into the frosting. Same job as in the batter: color amplifier. Keeps the frosting that vibrant pink without food dye.
• Vanilla extract - just a teaspoon. Rounds out the cream cheese tang.

How to Make Strawberry Sheet Cake

Making the Strawberry Purée

Add the strawberries to a food processor and pulse until completely smooth - no chunks. You need 1 cup of purée, so start with about 2 cups of whole berries. Set aside.

Don't drain it. The liquid is part of the moisture calculation in the batter.

Mixing the Batter

Preheat oven to 350°F. Grease a 9×13 inch pan and line with parchment if you want clean lift-out slices.

Whisk together the dry ingredients in a medium bowl - flour, baking powder, salt, and jello powder. Set aside.

In a large bowl, beat the butter, oil, and sugar together until light and fluffy. Add the eggs one at a time, then the vanilla and strawberry purée. Mix until smooth - it may look slightly curdled at this point, that's fine.

Add the dry ingredients gradually, alternating with the milk. Start and end with the dry ingredients. Mix until justcombined - stop when you can no longer see streaks of flour. Overmixing develops gluten and tightens the crumb.

Pour into the prepared pan and spread into an even layer.

Tips for the Best Strawberry Sheet Cake

Why Freeze-Dried Beats Fresh in Frosting

Fresh strawberries are about 90% water. Put them in cream cheese frosting and that water has nowhere to go - the frosting loosens, slides, and within an hour you have a pink puddle on top of your cake. Freeze-dried strawberries have had all that moisture removed, leaving behind pure concentrated flavor and pigment. One cup of freeze-dried berries pulsed to powder gives you more strawberry intensity than two cups of fresh, with zero impact on the frosting's structure. It's not a trendy swap - it's the only swap that actually works.

How to Get Perfect Pink Color Without Food Dye

Two things keep this cake pink from batter to finished slice:

1. Strawberry jello powder in the batter - fresh strawberry purée alone turns beige in the oven. The heat breaks down the pigment. Jello powder is heat-stable color that holds through a 35-minute bake.
2. Freeze-dried strawberry powder + jello powder in the frosting - the freeze-dried powder gives a natural deep pink, the jello amplifies it. Together they hit that vivid strawberry pink without a drop of red food coloring.

Skip either one and you'll get a pale cake and a pale frosting. Both stay in.

Don't Overbake - The Toothpick Test Explained

A completely clean toothpick means the cake is overdone. What you're looking for is a toothpick that comes out with a few moist crumbs clinging to it - not wet batter, not spotless. That's your window.

Start checking at 25 minutes. The cake continues cooking from residual heat after it comes out of the oven, so if you wait for a clean toothpick you've already gone too far. Pull it slightly underdone, leave it in the pan, and let carryover heat finish the job.

Substitutions and Variations

Can I Use Frozen Strawberries?

Yes - with one condition. Thaw them completely and drain off every drop of excess liquid before blending. Frozen berries release a lot of water as they thaw, and if that liquid goes into the batter your cake will be dense and wet rather than light and moist. Pat them dry with paper towels after draining if needed. The flavor will be slightly more intense than fresh, which isn't a bad thing.

Can I Use Different Berries?

Sort of. Blueberries will work for texture but the color will shift - expect a grayish-purple crumb rather than pink, which is fine if you're not chasing the pink. I'd skip blackberries and raspberries - blackberries add too much tartness and turn the batter an unappetizing dark gray, raspberries are too seedy to purée cleanly and the seeds end up in every bite. Stick with strawberries or blueberries.

Spice It Up or Switch the Glaze

The frosting is cream cheese based, so it's already tangy. If you want to lean into that, add a teaspoon of lemon zest to the frosting - it sharpens the strawberry flavor noticeably. For a less sweet cake, reduce the powdered sugar in the frosting by ½ cup and add an extra ounce of cream cheese to compensate for the lost body. The jello powder and freeze-dried powder stay regardless - they're doing structural and color work, not just flavor work.