In large saucepan over low heat, melt 1/2 cup margarine and 1 oz chocolate, stirring constantly until smooth. You can use your microwave also. Lightly spoon flour into measuring cup; level off. Add 1 cup and remaining base ingredients, mix well. Spread into prepared pan.
In a small bowl, combine all filling ingredients except 1/4 cup nuts and chocolate chips (last 2 ingredients in filling list). Beat 1 minute at medium speed until smooth and fluffy, stir in nuts. Spread over chocolate mixture, sprinkle evenly with chocolate chips. Bake for 25 to 35 minutes or until toothpick comes out clean. Immediately sprinkle marshmallows over top. Return to oven for 2 minutes.
In large saucepan over low heat, combine 1/4 cup margarine, milk, 1 oz unsweetened chocolate and reserved cream cheese; stir until well blended. Remove from heat, add powdered (confectioner) sugar, 1 tsp. vanilla; stir until smooth. Immediately pour frosting over marshmallows and lightly swirl with knife to give marble effect. Refrigerate until firm then cut into bars.
Good luck, I really hope you try this. It is a lot easier then it looks and is so good!
Source: Pillsbury Classic Cookbook
By Darlene from Fairview, PA
Wow, these are amazing. My family loved them. Thanks so much for the great recipe.