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Strawberry Shortcake Flag Cake

Strawberry shortcake flag cake is a patriotic American flag dessert made with fluffy vanilla cake, stabilized whipped cream, and juicy berries. Bake the vanilla layers in a 9x13 pan, then frost and arrange blueberries and strawberries into neat flag rows with piped white cream stripes.
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Course: Dessert
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

Cake Layers
  • 2.5 cup all-purpose flour
  • 2.5 tsp baking powder
  • 0.5 tsp salt
  • 1 lb unsalted butter softened (2 sticks)
  • 1.75 cup granulated sugar
  • 4 eggs room temperature
  • 1 tbsp pure vanilla extract
  • 1 cup whole milk room temperature
Whipped Cream Frosting
  • 3 cup heavy whipping cream cold
  • 0.33 cup powdered sugar
  • 1.5 tsp pure vanilla extract
  • 2 tbsp cornstarch to stabilize
Fruit Topping
  • 2 lb fresh strawberries hulled and halved
  • 1.5 cup fresh blueberries
  • 2 tbsp granulated sugar to macerate strawberries, optional

Equipment

  • 1 sheet pan
  • 1 hand mixer

Method
 

Bake the cake
  1. Preheat your oven to 350°F (175°C). Grease and flour a 9x13-inch baking pan and line the bottom with parchment paper.
  2. Whisk together the flour, baking powder, and salt in a medium bowl. Set aside for later.
  3. Beat the softened unsalted butter and granulated sugar in a large bowl on medium-high speed for 4–5 minutes until pale, fluffy, and doubled in volume. Keep the mixer running smoothly.
  4. Add the eggs one at a time, beating well after each addition. Mix until fully combined.
  5. Add the pure vanilla extract and mix until combined. Stop once the batter looks uniform.
  6. Reduce mixer speed to low and alternate adding the flour mixture and whole milk in three additions, starting and ending with flour. Mix just until combined and 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 until a toothpick inserted in the center comes out clean and the edges pull away from the sides. Remove when the center no longer jiggles.
  9. Let the cake cool in the pan for 10 minutes. Then transfer to a wire rack to cool completely before frosting for at least 1 hour, with the visual cue of fully cooled, no steam.
Make stabilized whipped cream
  1. Chill your mixing bowl in the freezer for 10 minutes while the cake cools. You want it cold to help the cream whip faster.
  2. Beat the cold heavy whipping cream, powdered sugar, cornstarch, and pure vanilla extract on medium-high speed until stiff peaks form. The visual cue is peaks that stand straight when you lift the beaters.
  3. Refrigerate the stabilized whipped cream until ready to use. Keep it cold so it pipes cleanly.
Macerate strawberries (optional)
  1. Toss the halved fresh strawberries with 2 tbsp granulated sugar and let macerate for 15 minutes. Stop when you see syrupy juices forming.
Assemble and decorate the flag design
  1. Place the fully cooled cake on a serving board or sheet pan. Ensure the top is completely cool to prevent melting cream.
  2. Frost the entire top and sides generously with stabilized whipped cream, smoothing it flat across the top. Use steady pressure so the surface looks even.
  3. Arrange the blueberries in a rectangular block in the upper-left corner of the cake (about 1/4 of the top surface) to represent the star field. Press lightly so they stay in place.
  4. Arrange the halved strawberries in neat rows across the remaining top surface, alternating with thin stripes of white whipped cream piped between rows. The visual cue is alternating red berry rows and pale cream stripes.
  5. Pipe a decorative border around the edges of the cake using remaining whipped cream if desired. Look for a crisp line along the perimeter.
  6. Refrigerate the finished cake for at least 30 minutes before serving to allow the whipped cream to set. Serve chilled within 24–48 hours for best freshness.

Notes

For the cleanest flag lines, keep the stabilized whipped cream cold and pipe with a firm, steady hand right after assembly. Store the cake covered in the refrigerator for 2–3 days; freezing is not recommended because the whipped cream and fresh berries can change texture. For a lighter option, swap half the heavy whipping cream for an equal amount of Greek yogurt (note: the frosting may be slightly softer).