Preheat your oven to 350°F (175°C) and prepare three 9-inch round cake pans by spraying them with nonstick cooking spray and lightly dusting with flour.

In a large mixing bowl, prepare the vanilla cake mix according to the package instructions, using only egg whites.

Divide the cake batter evenly into three separate bowls, coloring one bowl with red food coloring, another with blue, and leaving the third bowl plain.

Pour each colored batter into the prepared cake pans and bake for 10-12 minutes or until a toothpick inserted comes out clean.

Once baked, let the cakes cool for about 5 minutes before transferring to a wire rack.

Using a 2.5-inch circular cutter, cut out mini rounds from each cake layer.

Stack the mini layers by placing a blue layer first, followed by frosting, a white layer, more frosting, and finally a red layer.

Decorate the assembled mini cakes generously with red, white, and blue sprinkles.