1 c. mayonnaise
1 c. sugar
2 c. flour
1/4 tsp. salt
1 tsp. baking powder
1 tsp. baking soda
6 tsp. cocoa
1 tsp. vanilla extract
1 c. water

Cream together mayonnaise and sugar (medium speed). Add flour, salt, baking powder, baking soda, cocoa and vanilla. Add water. Mix at low speed until it comes together (pasty), then put mixer up to medium speed, mixing until a smooth liquid (if remains thick, add more water).

Preheat oven to 350 degrees. Grease pan with butter and 2 tablespoons flour. Bake on middle rack of oven at 350 degrees for 40-45 minutes.