Easy Red Velvet Two Layer Cake
["1 box white cake mix", "1 1/2 c. buttermilk", "3 egg whites", "1 c. cooking oil", "1 tsp. cocoa", "1 tsp. baking soda", "1/2 tsp. salt", "3 oz. red food coloring"]
["Bake at 300\u00b0 for 30 minutes."]
["white cake mix", "buttermilk", "egg whites", "cooking oil", "cocoa", "baking soda", "salt", "red food coloring"]