BASE:

1/2 c. butter
1 oz. unsweetened chocolate
1 c. sugar
1 c. flour
1/2 c. nuts, chopped
1 tsp. baking powder
1 tsp. vanilla
2 eggs, slightly beaten

Melt butter and chocolate. Add sugar and flour; mix well. Spread in greased pan (9 x 13-inch). Set aside.

FILLING:

6 oz. cream cheese, softened
1/2 c. butter
1 c. sugar
2 tbsp. flour
1 egg, beaten lightly
1/2 tsp. vanilla
2 c. miniature marshmallows

In a bowl, mix cream cheese, butter, sugar, flour, egg and vanilla. Beat until smooth. Spread over chocolate mixture. Bake at 350 degrees for 25 to 30 minutes. Sprinkle marshmallows over top. Bake 2 minutes more.

FROSTING:

1/3 c. butter
2 oz. unsweetened chocolate
1/3 c. milk
2 oz. cream cheese
4 c. powdered sugar
1 tsp. vanilla

Melt butter, chocolate, milk and cream cheese in pan; remove from heat. Add powdered sugar and vanilla. While bar is hot, spread on topping.