8 oz. butter, softened
10 oz. peanut butter
16 oz. powdered sugar
14 oz. graham cracker crumbs
12 oz. semi-sweet or milk chocolate chips

Mix above ingredients, except chocolate chips and pat into 9 x 13 pan. Melt chocolate chips in double boiler, and pour over graham cracker mixture. Chill 15-25 minutes in refrigerator, remove and cut into squares. Place back in refrigerator and leave overnight. It is very important to cut the cookies before letting them chill overnight.