1/2 c. mayonnaise
3/4 c. sugar
2 (1 oz.) squares unsweetened chocolate, melted
1/2 tsp. vanilla
1 c. flour
1/2 tsp. baking powder
1/3 c. milk
1/2 tsp. baking soda

Mix and bake at 350 degrees for 35 minutes. Nuts if wanted.