Peanut Butter Bars
["2 c. powdered sugar", "2 c. peanut butter", "1 stick margarine, melted", "1 c. brown sugar"]
["Mix well and pack into 9 x 12-inch container or cake pan. Melt 1 large package chocolate chips and 2 tablespoons margarine. Spread over top.", "Refrigerate.", "Cut into bars."]
["powdered sugar", "peanut butter", "margarine", "brown sugar"]