3 c. 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

In large bowl, add dry ingredients. Stir in mayonnaise. Gradually stir in water and vanilla; beat until smooth and well blended. Bake about 30 minutes at 350 degrees.