This is not the recipe that you want, but It is one of my favorites, and I wanted to share it with you...

Mud Bars

1 cup butter
2 cups sugar
4 eggs
1 1/2 cup flour
1/3 cup cocoa
1 cup chopped walnuts
3 cups miniature marsmallows
1/2 cup butter
4 cups powdered sugar
1/3 cup cocoa
1/2 cup evaporated milk

Cream together the butter and sugar until light and fluffy. Add eggs, one at a time, beating well after each addition. Sift cocoa and flour together, beat in gradually. Stir in walnuts. Spoon batter into a greased baking pan. Bake at 350 degrees for 30-35 minutes. Immediately sprinkle top of cake with marshmallows. Return to oven for 3-5 minutes utnil marshmallows are slightly puffed. Cool 30 minutes.

Frosting
Cream the butter. Combine powdered sugar and cocoa, and beat in alternately with milk. Beat until light and fluffy. Spread over marshmallow layer. Chill. To serve, cut in bars.