1/2 c. butter
1 1/2 c. graham cracker crumbs
1 (14 oz.) can sweetened condensed milk
1 (12 oz.) pkg. semi-sweet chocolate chips
1 c. Reese's peanut butter chips

Preheat oven to 350 degrees (325 degrees for glass dish). In 13x9 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 24 to 30 minutes or until lightly browned. Cool. Cut into bars. Store loosely covered at room temperature.