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. peanut butter chips

Preheat oven to 350 degrees. In 13"x9" 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 to 30 minutes until lightly browned. Cool and cut into bars. Makes 24 to 36 bars.