BAR:

1/2 c. butter
1 oz. unsweetened chocolate
1 c. sugar
1 c. plain flour
1/2-1 c. chopped nuts
1 tsp. baking powder
1 tsp. vanilla
2 eggs

Grease and flour 9x13 pan. In large saucepan over low heat, melt 1/2 cup butter and 1 ounce chocolate. Add remaining bar ingredients; mix well. Spread in pan.

FILLING:

8 oz. cream cheese, softened
1/2 c. sugar
2 tbsp. flour
1/4 c. softened butter
1 egg
1/2 tsp. vanilla
1/4 c. chopped nuts

In small bowl combine 6 ounces cream cheese with next 5 ingredients. Blend until fluffy and smooth. Stir in nuts and spread over chocolate mixture. Bake at 350 degrees for 25-35 minutes until toothpick in center comes out clean.

FROSTING:

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

Sprinkle with marshmallows and bake 2 minutes longer over low heat. In large saucepan melt 1/4 cup butter, 1 ounce chocolate, 2 remaining ounces cream cheese and milk. Stir in powdered sugar and vanilla until smooth. Immediately pour over marshmallows and swirl together. Store in refrigerator.