Preheat oven to 325 degrees and spray (3) 8-inch round cake pans with nonstick cooking spray.
Add the cake mix, flour and sugar to the bowl of a stand mixer fitted with the whisk attachment. Mix on low for 15-20 seconds until well combined.
1 white box cake mix, 1 cup all-purpose flour, 1 cup granulated sugar
Next, add the egg whites, milk, sour cream, oil, vanilla, and almond extract, mix on medium speed until thoroughly combined, 20-30 seconds.
4 egg whites, 1 cup milk, 1 cup sour cream, 1/3 cup vegetable oil, 1 ½ teaspoons vanilla extract, ¼ teaspoon almond extract
Divide the batter into 3 separate bowls. Add your desired food color to each bowl, stir until thoroughly combined.
gel food coloring
Pour batter into prepared pans and spread into an even layer. Bake for 22-25 minutes or until a toothpick inserted in the center comes out clean.
Remove pans from the oven, place on wire racks to cool for 10-15 minutes. Run a knife along the outside edge of the pan, invert cakes onto wire racks, and set at room temperature until completely cool, 45-60 minutes.