A patriotic flag cake decorated with strawberries, blueberries, and whipped cream is a stunning family Fourth of July centerpiece. This festive dessert celebrates America in the most delicious way.
Preheat the oven to 350°F (175°C) and butter a 9x13-inch pan thoroughly for even cake release.
In a large bowl, cream together the unsalted butter and granulated sugar until light and fluffy, about 3–4 minutes, then beat in eggs one at a time on medium speed.
Whisk flour, baking powder, and salt in a separate bowl, then add dry mixture to the wet ingredients in two batches, alternating with milk; mix until just combined to prevent overworking the batter.
Spread the batter evenly into the prepared pan and smooth the top with a spatula; bake for 28–32 minutes, or until a toothpick inserted in the center comes out clean.
Allow the cake to cool completely in the pan, then spread a generous, even layer of whipped cream over the surface.
Arrange blueberries in the upper left corner of the cake to form the 'stars' field; lay sliced strawberries in rows to represent the stripes, using remaining whipped cream for contrast.
Chill the decorated cake for at least 1 hour before serving to help the topping set and flavors meld.