Summer Berry Sheet Cake with Cream Cheese Frosting

Summer Berry Sheet Cake

If you want a dessert that looks like you spent hours in the kitchen but comes together with almost no fuss, this Summer Berry Sheet Cake is the answer. It starts with a box of white cake mix, gets loaded with juicy raspberries and blueberries, and finishes with a light cream cheese frosting and a pretty berry swirl on top.

The cake bakes in a 9×13 inch pan and serves 12 to 16, so it is perfect for summer parties, BBQs, potlucks, and picnics. It also fits patriotic holidays beautifully.

I bring it to Memorial Day cookouts, 4th of July gatherings, and Labor Day get togethers, and the red berries against the white frosting always get a reaction before anyone even takes a bite.

What I love most is how fresh it tastes. The berries stay soft and juicy inside the cake, and the frosting is creamy without being heavy. Prep takes about 15 minutes, and the oven does the rest of the work.

You can make it ahead, chill it, and slice it cold for clean, bakery style pieces. If you have been looking for an easy summer dessert that everyone will ask about, start here.

Why You’ll Love This Summer Berry Sheet Cake

• It starts with a cake mix, so the base is quick and dependable.
• It is loaded with raspberries and blueberries in every single bite.
• The frosting is light and creamy instead of thick and heavy.
• It is a wonderful make ahead dessert for busy summer weeks.
• It works for parties, BBQs, potlucks, and holiday tables.
• It looks festive with almost no decorating skill required.

What Is Summer Berry Sheet Cake?

Summer Berry Sheet Cake is an easy sheet cake made with white cake mix, raspberries, blueberries, and a light cream cheese frosting. It bakes in a 9×13 inch pan and is finished with a simple berry swirl made from strawberry or raspberry topping.

The ingredient list is short, the method is straightforward, and the result is festive enough for a holiday and simple enough for a weeknight. That combination is exactly why it earns a spot on so many summer tables.

Ingredients

Everything on this list is easy to find at any grocery store, and you probably already have some of it at home.

For the berry cake

• 1 box white cake mix
• The ingredients listed on the box, which are usually egg whites, water, and oil
• 1 cup blueberries
• 1 cup raspberries
• 2 to 3 teaspoons cornstarch

For the cream cheese frosting

• 8 oz cream cheese, softened
• 1 1/2 cups heavy whipping cream
• 2 teaspoons vanilla extract
• 1 cup powdered sugar

For decoration

• 1/3 to 1/2 cup strawberry or raspberry topping
• Fresh blueberries, optional

The white cake mix gives you a soft, fluffy base without any measuring, sifting, or guessing. The berries carry the flavor. You can use fresh or frozen blueberries and raspberries, and if you choose frozen, do not thaw them first. Frozen berries hold their shape and keep the batter from turning gray and watery.

Cornstarch is the quiet hero here. Tossing the berries in it keeps them from sinking to the bottom of the pan and stops the cake from getting too wet around the fruit. I toss the blueberries and raspberries in two separate bowls so the colors stay clean and the batter stays light.

The frosting is where that light, creamy texture comes from. Cream cheese brings a gentle tang, heavy whipping cream brings air, powdered sugar brings sweetness, and vanilla pulls it all together. Strawberry or raspberry topping creates the swirl on top, and a few fresh blueberries finish the red, white, and blue look.

One more thing worth knowing: this recipe makes 12 to 16 servings, so it feeds a crowd without any doubling.

How To Make Summer Berry Sheet Cake

This recipe has two simple parts: the berry cake and the cream cheese frosting. Read both before you start so the frosting goes on a completely cooled cake.

Part 1: The berry cake

1. Preheat the oven to 350°F. Grease a 9×13 inch baking dish and set it aside.
2. Prepare the cake batter according to the package directions.
3. In two separate bowls, toss the blueberries and the raspberries with cornstarch. If you are using frozen berries, do not thaw them first.
4. Fold the blueberries into the batter first, then gently fold in the raspberries. Spread the batter into the prepared baking dish.
5. Bake for 35 to 45 minutes, until the center is set and a toothpick inserted in the center comes out with a few moist crumbs attached. If the top starts browning too much, tent it loosely with aluminum foil. If you used frozen berries, the baking time may need to be extended to about 50 minutes.
6. Cool the cake completely before frosting.

Part 2: The cream cheese frosting

1. Beat the softened cream cheese with 1/2 cup of the powdered sugar until smooth.
2. In a separate bowl, beat the heavy whipping cream, the vanilla, and the remaining 1/2 cup of powdered sugar until stiff peaks form.
3. Fold the whipped cream mixture into the cream cheese mixture until fully combined.
4. Spread the frosting over the cooled cake. Drizzle the strawberry or raspberry topping over the frosting and swirl it with a skewer or a knife.
5. Refrigerate until ready to serve. Garnish with fresh berries right before serving.

The folding step matters more than it sounds. If you stir the whipped cream into the cream cheese instead of folding it, you knock out the air and the frosting turns dense. A rubber spatula and a light hand give you that fluffy finish.

Tips for the Best Berry Sheet Cake

• Toss the berries with cornstarch. It absorbs extra juice and keeps the cake from turning soggy around the fruit.
• Do not thaw frozen berries. Thawed berries release water and make the batter too wet.
• Fold gently. Raspberries crush easily, and crushed berries bleed color through the batter.
• Tent with foil. If the top browns before the center is set, lay a sheet of aluminum foil loosely over the pan.
• Cool completely before frosting. A warm cake melts the cream cheese frosting and makes it slide.
• Chill before serving. A few hours in the refrigerator gives you cleaner slices and a better texture.
• Add fresh berries at the end. Put them on right before serving so they stay firm and bright.

These small habits make the difference between a good cake and one that disappears in ten minutes at the cookout. I learned the foil trick the hard way after one very brown 4th of July cake, and now I keep a sheet of foil within reach every time.

Variations

This recipe is flexible, so use whatever looks best at the store or in your freezer.

• Swap the fruit. Blackberries or chopped strawberries can stand in for the raspberries or blueberries. Chop the strawberries into smaller pieces and toss all of the berries with cornstarch before folding them in.
• Change the swirl. Raspberry topping, strawberry topping, or blueberry sauce all work beautifully over the frosting.
• Add lemon zest. A little lemon zest in the frosting adds a fresh summer flavor that pairs wonderfully with berries.
• Change the cake mix. White, yellow, or vanilla cake mix all work as the base.

Keep the cornstarch step no matter which fruit you choose. It is the one detail that keeps every version from turning wet in the middle.

How to Store Berry Sheet Cake

Because of the cream cheese frosting, this cake needs to stay cold. Cover it and refrigerate for up to 4 days. For the best texture and flavor, let it sit at room temperature for about 15 to 20 minutes before serving. That short rest softens the frosting and wakes up the berry flavor without letting the cake get warm.

If you are serving it at a cookout, keep it in a cooler or in the shade until you are ready to slice it.

Make Ahead Instructions

This is one of my favorite make ahead desserts because it genuinely tastes better after a few hours in the refrigerator. The flavors come together, and the cake turns softer and more moist.

You have two easy options:

• Bake the cake a day ahead. Keep it covered at room temperature overnight, then frost it the next day before serving.
• Assemble the whole thing a day in advance. Frost it, cover it, and refrigerate it until you are ready to serve.

Either way, add the fresh berries on top right before serving for the best presentation. I usually frost mine the night before a party, then add blueberries and raspberries on top just before guests arrive. It takes one minute and makes the cake look like it came from a bakery.

More Summer Berry Desserts

If you love berries in dessert, these are worth trying next: No Bake Summer Berry Lasagna, Very Berry Dessert Lasagna, Strawberry Shortcake Cake, and Summer Berry Frozen Dessert. They all share the same fresh, fruity flavor that makes this sheet cake such a warm weather favorite.

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Summer Berry Sheet Cake

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Summer Berry Sheet Cake If you want a dessert that looks like you spent hours in the kitchen but comes together with almost no fuss, this Summer Berry Sheet Cake is the answer. It starts with a box of white cake mix, gets loaded with juicy raspberries and blueberries, and finishes with a light cream cheese frosting and a pretty berry swirl on top.

• Total Time: 60 min
• Yield: 12–16 1x

Ingredients

Scale 1x2x3x

Berry Cake
1 box white cake mix
ingredients listed on the box (egg whites, water, oil)
1 cup blueberries
1 cup raspberries
2–3 teaspoons cornstarch

Cream Cheese Frosting
8 oz cream cheese, softened
1 1/2 cups heavy whipping cream
2 teaspoons vanilla extract
1 cup powdered sugar

For Decoration
1/3–1/2 cup strawberry or raspberry topping
fresh blueberries

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Instructions

Berry Cake
1-Preheat oven to 350°F: Preheat oven to 350°F. Grease a 9×13-inch baking dish and set aside.
2-Prepare the cake batter according to the: Prepare the cake batter according to the package directions.
3-In two separate bowls, toss the blueberries: In two separate bowls, toss the blueberries and raspberries with cornstarch. If using frozen berries, do not thaw them first.
4-Fold the blueberries into the batter first,: Fold the blueberries into the batter first, then gently fold in the raspberries. Spread the batter into the prepared baking dish.
5-Bake for 35-45 minutes, or until the: Bake for 35-45 minutes, or until the center is set and a toothpick inserted in the center comes out with a few moist crumbs attached. Tent loosely with aluminum foil if the top starts browning too much. If using frozen berries, the baking time may need to be extended to about 50 minutes.
6-Cool the cake completely before frosting: Cool the cake completely before frosting.

Cream Cheese Frosting
7-Beat the softened cream cheese with 1/2: Beat the softened cream cheese with 1/2 cup powdered sugar until smooth.
8-In a separate bowl, beat heavy whipping: In a separate bowl, beat heavy whipping cream, vanilla, and remaining 1/2 cup powdered sugar until stiff peaks form.
9-Fold the whipped cream mixture into the: Fold the whipped cream mixture into the cream cheese mixture until fully combined.
10-Spread frosting over the cooled cake: Spread frosting over the cooled cake. Drizzle strawberry or raspberry topping over the frosting and swirl using a skewer or knife.
11-Refrigerate until ready to serve: Refrigerate until ready to serve. Garnish with fresh berries before serving.

Last Step:

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• Prep Time: 15 min
• Cook Time: 35 min
• Method: Baking

Nutrition

• Serving Size: 1 slice
• Calories: 286
• Fat: 14
• Carbohydrates: 37
• Fiber: 1
• Protein: 3