2 c. flour
1 c. sugar
1 1/2 tsp. baking powder
1/2 c. cocoa
1 tsp. baking soda
1 c. mayonnaise
1 c. water
1 tsp. vanilla

Grease 9 x 9 x 2 inch pan. Line bottom with wax paper, then grease wax paper. Mix and sift flour, sugar, cocoa, baking powder and soda into large bowl, stir in mayonnaise. Gradually stir in water and vanilla until smooth. Pour into prepared pan. Bake 45 minutes at 350 degrees. Cool completely. Remove from pan. Remove wax paper and frost with any desired frosting.