Mississippi Mud Cake 

1/2 cup butter,softened
1 cup sugar
3 eggs
3/4 cup flour
1/2 tsp. baking powder
Dash salt
1/4 cup plus 1 1/2 tbsp. cocoa
1 tsp. vanilla
1 cup chopped pecans
10 oz. pkg. marshmallows 

Cream butter; gradually add sugar beating well. Add eggs, one at a time, beating after each. Combine dry ingredients (except nuts) and add to creamed mixture.  Stir in vanilla and nuts.  Spoon butter into greased 13x9 glass baking pan. Bake at 325 F. For 15 to 18 minutes or until top is barely soft to touch. Remove from cake and cover top with marshmallows. Return to oven for 2 minutes, or until  marshmallows are soft. Spread marshmallows over top of cake, and immediately cover with chocolate frosting.let frosting harden before cutting into squares.