1 (18 1/2 oz.) chocolate cake mix (cake mix with the pudding in it)
1 (8 oz.) jar Hellmann's mayonnaise (1 c.)
3 eggs
1 c. water
1 can Duncan Hines ready to spread milk chocolate frosting
3 tbsp. peanut butter

Make cake mix according to box directions and also add the 1 cup of mayonnaise and 3 eggs and the 1 cup of water. Mix all ingredients well and pour into two 9 inch round cake pans. Bake at 350 degrees for 30-35 minutes.

Add the 3 tablespoons peanut butter to the ready to spread frosting and mix well. Spread peanut butter chocolate frosting over cooled cake.