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American Flag Cake

American flag cake is a patriotic sheet cake frosted in white buttercream, finished with a precise blueberry canton and uniform strawberry red stripes. It’s built as a full decorated flag fruit cake, with banana or extra frosting for the white stripes across the entire surface.
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Prep Time 45 minutes
Cook Time 35 minutes
cooling 1 hour
Total Time 2 hours 20 minutes
Servings: 20 servings
Course: Dessert
Cuisine: American
Calories: 620
Ingredients Equipment Method Notes

Ingredients
  

white cake mix
  • 2 box white cake mix Use the mix amounts in the box instructions (eggs, water, and oil/butter as directed).
frosting
  • 2 cup unsalted butter Softened.
  • 6 cup powdered sugar
  • 2 tsp vanilla extract
  • 5 tbsp heavy cream Add 4–6 tablespoons as needed for spreadable consistency.
decoration
  • 2 cup fresh blueberries
  • 2 lb fresh strawberries Hulled and sliced lengthwise.
  • 1 banana slices or extra white frosting for white stripes Use banana slices or pipe extra frosting for the white stripes.

Equipment

  • 1 sheet pan

Method
 

Bake the cake
  1. Bake both white cake mixes in a large 12x18 sheet pan or two 9x13 pans joined together according to package directions, then cool completely.
Make the white buttercream
  1. Beat softened unsalted butter until fluffy, then gradually add powdered sugar, vanilla extract, and 4–6 tablespoons heavy cream. Beat until the frosting is smooth and spreadable.
Frost and decorate the flag
  1. Frost the entire top of the cooled sheet cake with a thick, even layer of white buttercream.
  2. In the upper left corner, arrange fresh blueberries in a dense rectangle to form the canton.
  3. Create red stripes by arranging fresh strawberries flat across the length of the cake in even rows.
  4. Fill the white stripes by piping extra white frosting in rows between the strawberry rows or placing thin banana slices.
Chill and serve
  1. Refrigerate the cake until ready to serve, then slice into squares.

Notes

For a crisp, vivid flag design, keep the strawberries evenly sliced and press them lightly into the frosting so the rows stay straight. Store the American flag cake covered in the refrigerator for up to 3 days; freezing is not recommended because the fruit can soften. For a dairy-light option, use plant-based butter and substitute cream with a dairy-free heavy-cream alternative to keep the buttercream spreadable.