BASE:

1/2 c. butter
1 oz. unsweetened chocolate
1 c. flour
1 c. sugar
1 tsp. baking powder
1 tsp. vanilla
2 eggs
3/4 c. chopped nuts

FROSTING:

2 c. miniature marshmallows
1/4 c. butter
1/4 c. milk
1 tsp. vanilla
1 oz. unsweetened chocolate
3 c. 10X sugar, sifted

FILLING:

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

BASE: Heat oven to 350 degrees. Grease and flour 9x13 inch pan. In large saucepan over low heat (or in microwave), melt butter and chocolate. Lightly spoon flour into measuring cup and level off. Add flour and remaining ingredients. Mix well. Spread in prepared pan.

FILLING: In small bowl, combine all ingredients except nuts and chocolate chips. Beat until fluffy. Stir in nuts. Spread over base; sprinkle with chocolate chips. Bake at 350 degrees for 25-30 minutes.

FROSTING: When bars come out of oven, immediately sprinkle with marshmallows. Return to oven and bake 2 minutes more. In large pan over low heat (or in microwave), combine butter, milk, chocolate and reserved 2 oz. cream cheese, stirring until well blended. Remove from heat and stir in 10X and vanilla until smooth. Immediately pour over marshmallows and lightly swirl with knife to marble. Refrigerate until firm. Cut into bars.