Blueberry Sheet Cake is the kind of dessert that feels like summer in every single bite — a tender, buttery, perfectly moist cake studded with juicy fresh blueberries and brightened with a burst of lemon zest and juice, all topped with a luscious, creamy blueberry cream cheese frosting. This recipe is a celebration of simple, seasonal baking, transforming a classic sheet cake into a stunning, crowd-friendly dessert that’s perfect for picnics, potlucks, birthdays, or any occasion that calls for something special. The magic begins with a rich, velvety batter made from butter, sugar, eggs, buttermilk, and a generous amount of lemon zest and juice, which creates a tender, flavorful crumb with a bright, citrusy tang.
The brilliance of this cake lies in the blueberries themselves — tossed in flour to prevent sinking, then folded gently into the batter so they stay suspended throughout the cake, bursting with sweet-tart flavor in every bite. The frosting is a dreamy blueberry cream cheese mixture, made with softened butter, cream cheese, blueberry jam, and powdered sugar, whipped until light, fluffy, and impossibly smooth. Spread over the completely cooled cake, it adds a beautiful, pale purple layer of creamy, fruity sweetness. The result is a cake that is moist, fruity, tangy, and creamy — a true showstopper that’s as beautiful as it is delicious.
Why You’ll Love This Recipe:
- Tender, Moist, Buttery Cake: A rich, velvety crumb with a bright lemon tang.
- Bursting with Fresh Blueberries: Juicy berries in every bite.
- Creamy Blueberry Cream Cheese Frosting: Smooth, tangy, and perfectly sweet.
- Easy to Make and Serve: A simple sheet cake that feeds a crowd.
- Perfect for Any Occasion: Potlucks, birthdays, summer parties, or just because.
Ingredients:
For the Cake:*
2½ cups all-purpose flour, divided (1 tablespoon reserved for coating blueberries)
2 teaspoons baking powder
½ teaspoon baking soda
½ teaspoon salt
¾ cup unsalted butter, softened
1¾ cups granulated sugar
3 large eggs
2 teaspoons vanilla extract
1 cup buttermilk
3 tablespoons fresh lemon juice
2 cups fresh blueberries
Zest of 3 lemons (finely grated)
For the Frosting:*
3 cups powdered sugar
8 ounces cream cheese, softened
½ cup unsalted butter, softened
⅓ cup blueberry jam (or blueberry preserves)
1 teaspoon vanilla extract
Instructions:
Step 1: Preheat Oven and Prepare Pan*
Preheat your oven to 350°F (175°C). Grease and lightly flour a 9×13-inch baking pan, or line it with parchment paper.
Step 2: Mix Dry Ingredients*
In a medium bowl, whisk together 2½ cups of the flour, baking powder, baking soda, and salt. Set aside.
Step 3: Cream Butter and Sugar*
In a large bowl, beat the softened butter and granulated sugar together with an electric mixer for 2-3 minutes, until pale and fluffy.
Step 4: Add Eggs and Liquid*
Add the eggs one at a time, beating well after each addition. Mix in the vanilla extract and buttermilk. (The mixture may look slightly curdled — this is normal.)
Step 5: Add Dry Ingredients and Lemon*
Gradually add the flour mixture in two additions, mixing on low speed just until combined after each addition. Stir in the lemon zest and lemon juice.
Step 6: Fold in Blueberries*
Toss the fresh blueberries with the remaining 1 tablespoon of flour to coat them. Gently fold the floured blueberries into the batter.
Step 7: Bake*
Spread the batter evenly into the prepared pan. Bake for 35-40 minutes, until a toothpick inserted into the center comes out clean and the edges begin to pull away from the pan. Let the cake cool completely in the pan for at least 1 hour before frosting.
Step 8: Make the Frosting*
In a large bowl, beat the softened butter until pale and fluffy. Add the cream cheese and blueberry jam, and beat until smooth. Gradually add the powdered sugar, mixing well after each addition. Beat in the vanilla extract, then continue beating for 1-2 minutes until light and fluffy.
Step 9: Frost and Serve*
Spread the frosting evenly over the cooled cake. Slice and serve.
Tips:
- Use Fresh Blueberries: Fresh berries are best for this recipe, but you can use frozen (do not thaw) — toss them in flour and add to the batter.
- Don’t Overmix: Overmixing the batter after adding the flour can make the cake tough. Mix just until combined.
- Room Temperature Ingredients: Room temperature butter, eggs, and buttermilk blend more smoothly for a better crumb.
- Cool Completely Before Frosting: If the cake is warm, the frosting will melt and slide right off.
- Frosting Tip: For a softer frosting, add 1-2 tablespoons of milk or cream.
Storage Options:
- Room Temperature: Store frosted cake covered at room temperature for up to 2 days.
- Refrigerator: Store covered in the refrigerator for up to 5 days. Bring to room temperature before serving for best flavor.
- Freezer: This cake freezes well for up to 2 months. Wrap unfrosted cake tightly in plastic wrap and foil. Thaw at room temperature and frost before serving.
- Make-Ahead: Bake the cake a day ahead, cool, and store covered at room temperature. Frost the day you’re serving it.
Blueberry Sheet Cake is a beautiful, berry-filled celebration of simple summer baking. With its tender crumb, bright lemon notes, and creamy blueberry frosting, it’s a cake that will bring smiles to any table. Enjoy!
