Go Back

Strawberry Shortcake Flag Cake

Strawberry shortcake flag cake with a fluffy vanilla sponge, creamy whipped frosting, and rows of fresh berries arranged into a bold American flag. Baked in a 9×13 pan for easy layering and a slice-ready, cool-before-serving finish.
Print Recipe Pin Recipe
Prep Time 35 minutes
Cook Time 35 minutes
cooling + chilling 1 hour 30 minutes
Total Time 2 hours 40 minutes
Servings: 12 servings
Course: Dessert
Cuisine: American
Calories: 420
Ingredients Equipment Method Notes

Ingredients
  

Cake
  • 2.5 cup all-purpose flour
  • 2.5 tsp baking powder
  • 0.5 tsp salt
  • 0.75 cup unsalted butter softened
  • 1.75 cup granulated sugar
  • 4 eggs room temperature
  • 2 tsp pure vanilla extract
  • 1 cup whole milk room temperature
Whipped Cream Frosting
  • 3 cup heavy whipping cream very cold
  • 0.25 cup powdered sugar
  • 1 tsp pure vanilla extract
  • 8 oz cream cheese softened (for stability)
Fruit Topping
  • 3 cup fresh strawberries hulled and halved
  • 1 cup fresh blueberries
  • 2 tbsp strawberry jam optional, for shine

Equipment

  • 1 sheet pan
  • 1 electric mixer

Method
 

Bake the vanilla sponge
  1. Preheat the oven to 350°F (175°C). Grease and flour a 9×13-inch baking pan and line the bottom with parchment paper.
  2. Whisk the all-purpose flour, baking powder, and salt in a medium bowl, then set aside. This keeps the leavening evenly distributed.
  3. Beat the unsalted butter and granulated sugar with an electric mixer on medium-high for 3–4 minutes until light and fluffy. You’re aiming for a paler, airy texture.
  4. Add the eggs one at a time, beating well after each addition. Mix until the batter looks smooth and cohesive.
  5. Mix in the pure vanilla extract. Stop as soon as it’s incorporated.
  6. With the mixer on low, alternately add the flour mixture and whole milk in three additions, beginning and ending with flour. Mix until just combined—do not overmix.
  7. Pour the batter into the prepared pan and smooth the top. Tap the pan lightly to level the surface.
  8. Bake for 30–35 minutes at 350°F (175°C), until a toothpick inserted in the center comes out clean and the top is golden. Watch for browning at the edges.
  9. Let the cake cool in the pan for 10 minutes. The structure sets so it releases cleanly.
  10. Transfer to a wire rack and cool completely, at least 1 hour. The cake must be fully cool before frosting to prevent melting.
Make the whipped cream frosting
  1. Beat the cream cheese in a large bowl until smooth. This creates a stable base for the airy frosting.
  2. In a separate chilled bowl, whip the heavy whipping cream, powdered sugar, and pure vanilla extract until soft peaks form. The mixture should hold a gentle curl.
  3. Fold the whipped cream into the cream cheese until fully combined and fluffy. Mix gently to keep the frosting light.
Assemble the flag cake
  1. Spread the whipped cream frosting generously and evenly over the completely cooled cake. Smooth the surface with an offset spatula.
  2. Arrange the fresh blueberries in the top-left corner in a rectangle for the star field, about 4–5 rows. Place them close together for a dense pattern.
  3. Arrange the halved fresh strawberries in rows across the rest of the cake to create the red stripes, alternating with the white frosting showing as the white stripes. Keep the rows straight for a crisp flag look.
  4. If desired, lightly brush the strawberries with warmed strawberry jam for extra shine. Use a thin layer so it doesn’t run.
  5. Refrigerate for at least 30 minutes before slicing. The frosting firms up for clean cuts.

Notes

Pro tip: make sure the cake is completely cool (at least 1 hour) and keep the cream very cold so the frosting whips into soft peaks and stays fluffy. Refrigerate covered for up to 3 days; freeze the baked cake only (wrap well) for up to 2 months, then thaw and assemble. For a lighter option, use 1 cup heavy whipping cream plus 2 cups reduced-fat whipping cream, noting the frosting may be slightly less stable.