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Easy 3-Step Flag Sheet Cake Recipe with Fresh Berries for Perfect Summer Desserts

flag sheet cake - featured image

A light, refreshing, and festive flag sheet cake topped with whipped cream and fresh berries, perfect for summer gatherings and easy to make in just three steps.

Ingredients

Scale
  • 1 box yellow cake mix (Duncan Hines recommended)
  • 1 cup water (240 ml)
  • 1/3 cup vegetable oil (80 ml)
  • 3 large eggs, room temperature
  • 2 cups heavy whipping cream (480 ml), chilled
  • 1/4 cup powdered sugar (30 g)
  • 1 teaspoon pure vanilla extract
  • 1 cup fresh strawberries, hulled and sliced
  • 1 cup fresh blueberries
  • 1 cup fresh raspberries
  • Optional: 1 tablespoon granulated sugar for macerating berries

Instructions

  1. Preheat oven to 350°F (175°C). In a large bowl, combine yellow cake mix, water, vegetable oil, and eggs. Beat with an electric mixer on medium speed until smooth and lump-free, about 2 to 3 minutes.
  2. Pour batter evenly into a greased 9×13-inch pan. Smooth the top with a spatula. Bake for 25 to 30 minutes or until a toothpick inserted in the center comes out clean. Let cool completely on a wire rack or countertop for 45 minutes to 1 hour.
  3. Chill mixing bowl and beaters for 10 minutes. Whip heavy cream with powdered sugar and vanilla extract until stiff peaks form. Spread whipped cream evenly over cooled cake. Arrange strawberries, blueberries, and raspberries in a flag pattern on top. Optionally sprinkle powdered sugar on top.

Notes

Chill the mixing bowl and beaters before whipping cream for best results. Use room temperature eggs for smoother batter. Let the cake cool completely before adding whipped topping to prevent melting. Fresh berries are best, but thawed and drained frozen berries can be used. Assemble just before serving for best appearance and freshness.

Nutrition

Keywords: flag cake, summer dessert, fresh berries, easy cake recipe, 4th of July dessert, whipped cream topping, sheet cake