2 c. flour
1 c. sugar
4 tbsp. cocoa
1/4 tsp. baking powder
2 tsp. baking soda dissolved in 1 c. warm water
1 c. mayonnaise
1 tsp. vanilla

Mix dry ingredients together. Add mayonnaise, water with soda and vanilla. Mix well. Pour into greased 9x9 inch pan. Bake at 350 degrees for 35 minutes.