Double Delicious Cookie Bars
["1/2 c. butter or margarine", "1 1/2 c. graham cracker crumbs", "1 (14 oz.) sweetened condensed milk", "1 (12 oz.) pkg. chocolate chips", "1 (12 oz.) pkg. peanut butter chips"]
["Preheat oven to 350\u00b0.", "In a 13 x 9-inch baking pan, melt margarine in oven.", "Sprinkle crumbs evenly over margarine.", "Pour sweetened condensed milk evenly over crumbs.", "Top with chips; press down firmly.", "Bake 25 to 30 minutes or until lightly browned.", "Cool.", "Cut into bars."]
["butter", "graham cracker crumbs", "condensed milk", "chocolate chips", "peanut butter"]