Chocolate Mayonnaise Cake
["2 c. flour", "1 c. sugar", "1/4 to 1/2 c. cocoa", "1 1/2 tsp. soda", "1 1/2 tsp. baking powder", "1 c. water", "2 tsp. vanilla", "3/4 c. mayonnaise"]
["Mix together; put in 9 x 9-inch pan and bake at 350\u00b0 until done and frost with any white powdered sugar frosting."]
["flour", "sugar", "cocoa", "soda", "baking powder", "water", "vanilla", "mayonnaise"]