Easy Red Velvet Cake
["1 box yellow cake mix (without pudding)", "milk (substitute for water in cake mix)", "2 Tbsp. cocoa", "1 tsp. vinegar", "2 eggs (or amount cake mix requires)", "1 oz. red food coloring", "1/2 c. vegetable oil"]
["Preheat oven to 350\u00b0. Mix ingredients thoroughly. Pour into 2 (8-inch) round cake pans or 1 (9 x 13-inch) pan.", "Bake 30 to 35 minutes, until cake tests done. When cake is cool, frost with cream cheese frosting."]
["yellow cake", "milk", "cocoa", "vinegar", "eggs", "red food coloring", "vegetable oil"]