Step one
Mix white cake mix, egg whites, oil, water and sour cream for three to four minutes on medium speed. Split cake batter into three equal amounts, adding red and blue food coloring to two of the portions. Coat three, 4 x 9-inch bread pans with cooking spray and lightly flour the bottoms. Add the three batters to the pans and bake at 350 degrees F for 18-23 minutes. Allow them to cool and remove from pans.