Rocky Road Fudge Bars

"crust":
1/2 c. butter or margarine
1 oz. unsweetened chocolate
1 c. sugar
1 c. flour
1/2 c. nuts (pecans)
1 tsp. baking powder
1 tsp. vanilla
2 eggs

Filling:
1/2 c. sugar
2 Tbsp. flour
1/4 c. butter or margarine (soft)
1/2 tsp. vanilla
1 egg
1/4 c. chopped nuts
6 oz. cream cheese

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

In large pan, melt butter and chocolate over low heat; remove from heat. Add sugar, flour nuts, baking powder, vanilla and eggs; mix well. Spread in greased and floured 13 x 9 pan. In bowl, combine filling ingredients. Spread over chocolate mixture. Bake at 350 for 25-35 min. until toothpick comes out clean. Sprinkle with marshmallows. Bake 2 min. longer. Immediately prepare frosting by combining butter, chocolate, cream cheese, and milk in pan. Heat over low heat until chocolate melts. Stir in powdered sugar and vanilla until smooth. Pour over marshmallows and swirl together. Cool and cut.