Preheat your oven to 350°F (175°C). Spray three 9-inch cake pans with nonstick spray and dust with flour.

In a mixing bowl, prepare the vanilla cake mix according to package instructions, replacing whole eggs with egg whites.

Divide the prepared batter into three portions. Color one portion red, the second blue, and leave the third uncolored.

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

Cool the cakes in pans for 5-10 minutes, then transfer to a wire rack to cool completely.

Cut out 7 circles from each cake layer using a 2.5-inch circle cutter, leveling any domed layers.

Assemble the cakes by layering a blue circle, frosting, white circle, frosting, and finally a red circle. Repeat until all circles are stacked.

Frost the sides of each mini cake and decorate the top with red, white, and blue sprinkles. Serve immediately or store until ready.