1/2 c. butter
1 sq. unsweetened chocolate
1 c. sugar
1 c. all-purpose flour
1/2 - 1 c. chopped nuts
1 tsp. baking powder
1 tsp. vanilla
2 eggs

FILLING:

8 oz. cream cheese, reserve 2 oz. for frosting
1/2 c. sugar
2 tbsp. flour
1/4 c. butter
1 egg
1/2 tsp. vanilla
1/4 c. chopped nuts
6 oz. pkg. (1 c.) chocolate chips

FROSTING:

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

Heat oven to 350 degrees. Grease and flour 9x13 inch pan.

In large saucepan over low heat, melt 1/2 cup butter and 1 square unsweetened chocolate. Lightly spoon flour into measuring cup. Level off, add remaining bar ingredients; mix well. Spread in prepared pan.

In small bowl, combine 6 oz. cream cheese with next 5 filling ingredients. Beat 1 minute at medium speed until smooth and fluffy; stir in nuts. Spread over chocolate mixture. Sprinkle with chocolate chips. Bake at 350 degrees for 25- 35 minutes or until toothpick comes out clean. Remove from oven; sprinkle with marshmallows. Bake 2 minutes longer.

In large saucepan, over low heat, melt 1/4 cup butter, 1 square unsweetened chocolate, remaining 2 oz. cream cheese and mix. Stir in powdered sugar and vanilla until smooth. Immediately pour over marshmallows and swirl together. Cool.