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. nuts

FILLING:

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

FROSTING:

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

Heat oven to 350 degrees. Grease and flour 13 x 9 inch pan. In saucepan, melt butter and chocolate. Spoon in flour and remaining dry ingredients; spread in pan. In small bowl, combine all filling ingredients, except nuts and chocolate chips. Beat 1 minute at medium; stir in nuts. Spread over base mixture. Sprinkle with chocolate chips. Bake 25 to 35 minutes. Immediately sprinkle marshmallows over top. Return and bake 2 minutes.

In saucepan, heat butter, milk, chocolate, and cream cheese until blended. Remove from heat; stir in powdered sugar and vanilla. Pour over marshmallows and lightly swirl. Refrigerate until firm.