Peanut Butter-Ups
["1 c. butter or margarine", "1 c. peanut butter", "2 c. graham cracker crumbs", "2 to 2 1/2 c. confectioners sugar", "1 c. chocolate chips", "2 Tbsp. shortening"]
["Mix butter and peanut butter in 2-quart bowl.", "Microwave on High (100%) for 1 1/2 to 2 minutes or until melted.", "Blend well. Mix in crumbs and sugar until very stiff.", "Press firmly in buttered 12 x 8-inch or 13 x 9-inch pan."]
["butter", "peanut butter", "graham cracker crumbs", "confectioners sugar", "chocolate chips", "shortening"]