Chocolate Mayonnaise Cake
["3 c. unsifted flour", "1 1/2 c. sugar", "1/3 c. cocoa", "2 1/4 tsp. baking powder", "1 1/2 tsp. baking soda", "1 1/2 c. mayonnaise", "1 1/2 c. water", "1 1/2 tsp. vanilla"]
["Sift together dry ingredients into large bowl.", "Stir in mayonnaise.", "Gradually stir in water and vanilla until smooth and blended.", "(Batter will be thin.)", "Pour into prepared pan.", "Bake in 350\u00b0 oven for 30 minutes."]
["flour", "sugar", "cocoa", "baking powder", "baking soda", "mayonnaise", "water", "vanilla"]