Name: Summer Berry Sheet Cake Recipe
Prep time: 20 min
Cook time: 45 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: 1 box white cake mix; Ingredients listed on the box (egg whites, water, oil); 1 cup (145 g) blueberries; 1 cup (125 g) raspberries; 2–3 teaspoons cornstarch; 8 oz cream cheese, softened; 1 ½ cups heavy whipping cream; 2 teaspoons vanilla extract; 1 cup powdered sugar; 1/3–1/2 cup strawberry or raspberry topping; Fresh blueberries for garnish

Print Recipe· 3.9 from 13 reviews

If you’re craving a show-stopping dessert that’s bursting with fresh flavors and perfectly balances lightness and indulgence, this Summer Berry Sheet Cake Recipe is exactly what you need. Imagine a moist, tender white cake studded with juicy berries, topped with a fluffy cream cheese whipped frosting and swirled with luscious berry topping. It’s a dessert that screams summer celebration with every bite, ideal for backyard gatherings, potlucks, or simply treating yourself on a sunny afternoon. Once you try this cake, it’ll become your go-to for a sweet, fruity escape that’s as refreshing as it is delightful.

Ingredients You’ll Need

The image shows three bowls on a white marbled surface. On the left, there is a white bowl filled with dark blue blueberries covered in a light dusting of white powder. Below it, a smaller clear bowl holds red raspberries coated in white powder. On the right side, a large clear glass bowl contains a smooth, pale yellow batter with tiny air bubbles, and a wooden spoon with a red tip resting inside. photo taken with an iphone --ar 4:5 --v 7

Everything you need for this Summer Berry Sheet Cake Recipe can be found in your pantry or local grocery store. The ingredients are simple yet essential, each adding to the perfect balance of flavor, texture, and freshness that makes this cake so irresistible.

White cake mix: The foundation for a soft and moist crumb that lets the berries shine.
Egg whites, water, oil: Follow the cake mix box directions for these; they keep the cake tender and rise just right.
Blueberries (1 cup, 145 g): These burst with juicy sweetness and add beautiful pops of color.
Raspberries (1 cup, 125 g): Slightly tart, they contrast perfectly with the creamy frosting.
Cornstarch (2–3 teaspoons): Keeps the berries from sinking or turning the batter too runny by thickening their juices.
Cream cheese (8 oz, softened): Provides richness and tanginess to the frosting that pairs exquisitely with berries.
Heavy whipping cream (1 ½ cups): Whipped to stiff peaks, it makes the frosting light and airy.
Vanilla extract (2 teaspoons): Enhances all the subtle flavors, tying everything together perfectly.
Powdered sugar (1 cup): Adds sweetness without any grittiness, ensuring a smooth frosting.
Strawberry or raspberry topping (1/3–1/2 cup): Swirled on top for a glossy finish and an extra berry punch.
Fresh blueberries: For the final garnish, making the cake look as fresh as it tastes.

How to Make Summer Berry Sheet Cake Recipe

Step 1: Prepare Your Cake Batter

Preheat your oven to 350°F and grease a 9×13-inch baking dish to keep the cake from sticking. Prepare the white cake mix according to the package directions using egg whites, water, and oil—this creates the base for your tender sheet cake.

Step 2: Toss and Fold in the Berries

In two separate bowls, toss the blueberries and raspberries with cornstarch. This quick step prevents the berries from sinking to the bottom and stops their juice from making the cake too wet. If you’re using frozen berries, there’s no need to thaw them—just toss and fold directly into the cake batter.

Step 3: Combine and Spread

Gently fold the blueberries into the batter first, then carefully fold in the raspberries. Spread this beautiful berry-studded batter evenly into your prepared baking dish to ensure even baking and berry distribution.

Step 4: Bake to Perfection

Bake the cake for 35 to 45 minutes or until the center is set and a toothpick inserted comes out with a few moist crumbs. If the top starts browning too much, tent loosely with foil to prevent overbaking. For frozen berries, baking might take up to 50 minutes, so keep an eye on it.

Step 5: Cool Completely Before Frosting

Let your cake cool fully in the pan—this step is crucial for the frosting to spread smoothly without melting or sliding off.

Step 6: Make the Cream Cheese Frosting

Beat the softened cream cheese with half of the powdered sugar until smooth and silky. In a separate bowl, whip the heavy cream, vanilla extract, and remaining powdered sugar until stiff peaks form. Fold this whipped mixture into the cream cheese gently for a frosting that’s both light and decadently creamy.

Step 7: Frost and Swirl

Spread the luscious frosting evenly over your cooled cake. Drizzle your choice of strawberry or raspberry topping on top and use a skewer or knife to swirl it into pretty patterns that will wow your guests.

Step 8: Chill and Garnish

Refrigerate the cake until you’re ready to serve. Just before presenting, scatter fresh blueberries on top for that finishing touch of color and freshness.

How to Serve Summer Berry Sheet Cake Recipe

A rectangular white ceramic dish holds a baked cake with a smooth top layer that is light golden brown. The surface is dotted with small, scattered dark blue and red berries, some slightly sunken into the cake, creating a mix of purples and reds where the juices have spread. The cake appears soft and fluffy with a lightly crisp edge along the sides inside the dish. The dish sits on a white marbled surface with a clean and bright background. photo taken with an iphone --ar 4:5 --v 7

Garnishes

Fresh berries are your best friend when it comes to garnishing this sheet cake—blueberries, raspberries, or even a few mint leaves add a burst of freshness and elegance. A light dusting of powdered sugar over the top also gives a delicate, pretty look that makes every slice feel special.

Side Dishes

Pair this cake with a scoop of vanilla bean ice cream or a dollop of whipped cream to highlight its creamy frosting. Fresh berries on the side or a simple green salad with citrus vinaigrette can balance the richness, making this cake ideal for summer brunches or afternoon tea.

Creative Ways to Present

For an unforgettable presentation, cut the sheet cake into neat squares and layer them with extra whipped cream and berries into glass parfait cups. Or, serve individual slices on vintage plates with edible flowers as an elegant touch that screams celebration.

Make Ahead and Storage

Storing Leftovers

Once frosted, keep your Summer Berry Sheet Cake Recipe covered in an airtight container or wrapped tightly with plastic wrap in the refrigerator. It stays fresh for up to 3 days, making it great for enjoying over a few days or sharing with friends and family.

Freezing

You can freeze the unfrosted cake layer by wrapping it tightly in plastic wrap and aluminum foil. Freeze for up to 2 months. When ready, thaw it overnight in the refrigerator before frosting. Freezing after frosting is not recommended, as the whipped cream texture can become grainy.

Reheating

This cake is best served chilled or at room temperature, so reheating is usually unnecessary. If desired, bring refrigerated slices to room temperature for about 20 minutes before serving to enjoy the full range of flavors and creamy texture.

FAQs

Can I use frozen berries in the Summer Berry Sheet Cake Recipe?

Absolutely! Use frozen berries straight from the freezer without thawing, and toss them with cornstarch to prevent excess moisture. You may need to extend the baking time slightly to account for the frozen fruit.

Can I make this cake gluten-free?

Yes! Simply substitute the white cake mix with a gluten-free cake mix of your choice, ensuring it’s suitable for the berry-filled batter. The rest of the recipe remains the same.

What if I don’t have cream cheese for the frosting?

You can try a whipped cream frosting on its own, but the cream cheese adds that perfect tang and richness that balances the sweetness of the berries, so it’s highly recommended for the best flavor.

How do I prevent berries from sinking in the batter?

Tossing the berries in cornstarch before folding them into the batter is key. It thickens the berry juices and helps suspend the fruit evenly throughout the cake as it bakes.

Can I use mixed berries instead of just blueberries and raspberries?

Definitely! Feel free to experiment with strawberries, blackberries, or even cherries. Just be sure to adjust cornstarch slightly if the berries are very juicy to keep your batter from getting too wet.

Final Thoughts

This Summer Berry Sheet Cake Recipe is a true celebration of summer’s freshest flavors, wrapped up in a cake that feels both comforting and elegant. It’s the kind of dessert that brings smiles, sparks conversation, and begs for seconds. Whether you’re baking for family, friends, or simply yourself, this cake will brighten up your table and your day. Give it a try and enjoy the burst of juicy berries combined with creamy frosting in every delicious bite!