1/2 c. butter
1 oz. (1 sq.) unsweetened chocolate
1 c. Pillsbury's Best all-purpose flour or unbleached flour
1 c. sugar
1 tsp. baking powder
1 tsp. vanilla
2 eggs
3/4 c. chopped nuts

Heat oven to 350 degrees. Grease and flour 13 x 9 inch pan. In large saucepan over low heat, melt 1/2 cup butter and 1 ounce chocolate, stirring constantly until well blended. Lightly spoon flour into measuring cup; level off. Add 1 cup flour and remaining base ingredients; mix well. Spread in prepared pan.

FILLING:

8 oz. pkg. cream cheese, softened, reserving 2 oz. for 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. pkg. (1 c.) semi-sweet chocolate chips, if desired

In small bowl, combine all filling ingredients except 1/4 cup nuts and chocolate chips. Beat 1 minute at medium speed until smooth and fluffy; stir in nuts. Spread over chocolate mixture, sprinkle evenly with chocolate chips. Bake at 350 degrees for 25 to 35 minutes or until toothpick inserted in center comes out clean.

FROSTING:

2 c. miniature marshmallows
1/4 c. butter
1/4 c. milk
1 oz. (1 sq.) unsweetened chocolate
3 c. powdered sugar, sifted
1 tsp. vanilla

Immediately sprinkle marshmallows over top. Return to oven and bake an additional 2 minutes. In large saucepan over low heat, combine 1/4 cup butter, milk, 1 ounce chocolate and reserved 2 ounces cream cheese, stirring until well blended. Remove from heat; stir in powdered sugar and 1 teaspoon vanilla until smooth. Immediately pour frosting over marshmallows and lightly swirl to marble with knife. Refrigerate until firm; cut into bars. 36 bars.