Make, bake and serve it all in the same pan. It's cake with it's own sauce.

CAKE:

3/4 c. sugar
1 c. all-purpose flour
1/4 tsp. salt
2 tsp. baking powder
2 tbsp. cocoa
1/2 c. milk
3 tbsp. melted butter, cooled
1 tsp. vanilla

TOPPING:

1/2 c. sugar
1/2 c. brown sugar
1/4 c. cocoa
1 1/2 c. water

In a 9 inch square baking pan, sift sugar, flour, salt, baking powder and cocoa. Stir in milk, melted butter and vanilla. Spread batter in pan. Mix topping sugars and cocoa and sprinkle over batter. Pour water over all and bake at 350 degrees (moderate oven) for 45 minutes or until top springs back when lightly touched.