Easy Red Velvet Cake
["1 box butter cake mix", "1 tsp. cocoa", "1 tsp. vanilla", "1 c. buttermilk", "1 bottle red food coloring", "1 stick margarine, softened", "3 eggs", "1 tsp. baking soda", "1 Tbsp. vinegar"]
["Mix cake mix with cocoa.", "Add vanilla, buttermilk, food coloring, margarine and eggs.", "Blend until moistened.", "Add soda, vinegar.", "Beat 4 minutes at medium speed.", "Bake at 375 degrees in three layers for 30 minutes.", "Use Cream Cheese Frosting."]
["butter cake mix", "cocoa", "vanilla", "buttermilk", "coloring", "margarine", "eggs", "baking soda", "vinegar"]