Grandma'S Mayonnaise Cake
["2 c. flour", "1 c. sugar", "4 Tbsp. cocoa", "1 1/2 tsp. baking powder", "1 1/2 tsp. baking soda", "1 c. mayonnaise", "1 c. cold water", "2 tsp. vanilla"]
["Mix all ingredients together in a large mixing bowl.", "Bake in greased and floured cake pans (use two 8-inch pans or one 9 x 13-inch pan) for 30 minutes at 350\u00b0."]
["flour", "sugar", "cocoa", "baking powder", "baking soda", "mayonnaise", "cold water", "vanilla"]