1/2 c. butter
1 1/2 c. graham cracker crumbs
14 oz. can condensed milk
1 c. (6 oz.) semi-sweet chocolate chips
1 c. (6 oz.) peanut butter flavored chips

Preheat oven to 350°F. In 13 x 9-inch baking pan, melt butter in oven. Sprinkle crumbs evenly over butter; pour condensed milk evenly over crumbs. Top with chips; press down firmly with spoon.

Bake 25 to 30 minutes or until lightly browned. Cool. Cut into bars. Store, covered, at room temperature.