1/2 c. butter
1 1/2 c. graham cracker crumbs
1 (14 oz.) can sweetened condensed milk (not evaporated milk)
2 c. (12 oz.) semi-sweet chocolate chips
1 c. peanut butter chips

Preheat oven to 350 degrees (325 degrees for glass pan). In 13 x 9 inch baking pan. Melt butter in oven. Sprinkle crumbs evenly over butter; pour sweetened condensed milk evenly over crumbs. Top with chips; press down firmly. Bake 25-30 minutes or until lightly browned. Cool. Cut into bars. Store loosely covered at room temperature. It always magic when chocolates involved.