Chocolate Cake
["1 devil's food chocolate cake mix", "1/2 c. flour", "1/2 c. sugar", "3 Tbsp. cocoa", "1 tsp. baking powder", "1/2 tsp. baking soda", "1/2 c. margarine", "2 c. cold coffee", "1 tsp. vanilla", "4 egg yolks", "4 egg whites, beaten"]
["Beat egg whites until stiff.", "In another bowl mix all other ingredients.", "Fold in beaten egg whites.", "Pour into greased and floured 13 x 9-inch pan.", "Bake at 350\u00b0.", "Frost when cool with Luxury Chocolate Frosting."]
["chocolate cake", "flour", "sugar", "cocoa", "baking powder", "baking soda", "margarine", "cold coffee", "vanilla", "egg yolks", "egg whites"]