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Perfect American Flag Strawberry Blueberry Sheet Cake with Cream Cheese Frosting

American Flag Strawberry Blueberry Sheet Cake - featured image
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A colorful and creamy sheet cake decorated with fresh strawberries and blueberries to mimic the American flag, perfect for summer holidays and gatherings.

Ingredients

Scale
  • 2 ½ cups (310 g) all-purpose flour
  • 2 ½ teaspoons baking powder
  • ½ teaspoon baking soda
  • ½ teaspoon salt
  • 1 cup (226 g) unsalted butter, softened
  • 1 ¾ cups (350 g) granulated sugar
  • 3 large eggs, room temperature
  • 1 teaspoon pure vanilla extract
  • 1 cup (240 ml) buttermilk, room temperature (or milk with 1 tablespoon lemon juice)
  • 8 oz (225 g) cream cheese, softened
  • ½ cup (115 g) unsalted butter, softened
  • 4 cups (480 g) powdered sugar, sifted
  • 1 teaspoon vanilla extract
  • 2–3 tablespoons milk, as needed for consistency
  • 1 ½ cups fresh strawberries, sliced
  • 1 ½ cups fresh blueberries, washed and dried

Instructions

  1. Preheat oven to 350°F (175°C). Grease a 9×13-inch sheet cake pan and line the bottom with parchment paper.
  2. In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
  3. In a large bowl, beat softened butter and granulated sugar on medium speed until fluffy and pale, about 3-4 minutes.
  4. Beat in eggs one at a time, mixing well after each. Stir in vanilla extract.
  5. Reduce mixer speed to low. Add dry ingredients in three batches, alternating with buttermilk, starting and ending with dry ingredients. Mix just until combined.
  6. Pour batter into prepared pan and spread evenly. Tap pan gently to release air bubbles.
  7. Bake for 35-40 minutes, checking at 35 minutes with a toothpick; it should come out with a few moist crumbs but no raw batter.
  8. Cool cake in pan on wire rack for 20 minutes, then remove from pan and cool completely before frosting.
  9. Beat cream cheese and softened butter until smooth. Gradually add powdered sugar and vanilla extract. Add milk one tablespoon at a time until spreadable but firm consistency is reached.
  10. Spread frosting evenly over cooled cake.
  11. Arrange sliced strawberries in horizontal stripes on one half of the cake.
  12. Fill the other half with blueberries in a block shape to mimic the American flag’s stars section.
  13. Gently pat berries to stick slightly to frosting but keep their shape.

Notes

Use fresh berries to avoid excess moisture. Cool cake completely before frosting to prevent melting. Slice large strawberries thinly for easier layering. You can refrigerate the cake before frosting if in a hurry. For gluten-free, use a 1-to-1 gluten-free flour blend and add extra baking powder. Vegan adaptations include using vegan margarine, flax eggs, and plant-based cream cheese.

Nutrition

Keywords: American flag cake, strawberry blueberry cake, cream cheese frosting, Fourth of July dessert, patriotic cake, summer sheet cake, berry cake

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