Mix together cake mix, egg whites, water and oil for 2 minutes on medium speed.
Grease three 9 inch round pans and line the bottom with a circle of parchment. Divide the batter into the three pans.
Bake at 350 degrees for about 15 minutes.
Allow the cakes to cool for 15 minutes and then flip them over on a cooling rack, peel off the parchment and flip them right side up again to finish cooling.