Double Chip Bars

1/2 cup butter
1-1/2  cups graham cracker crumbs
1 can (14 ounces) sweetened condensed milk
2 cups (12 ounces each) semisweet chocolate chips
1 cup peanut butter chips

Place butter in a 13" x 9" x 2" baking pan; place in a 350 degree oven until melted.  Remove baking pan from the oven.  Sprinkle the cracher crumbs evenly over butter.  Pour the milk evenly over the crumbs.  Sprinkle with chips; press down firmly.  Bake at 350 for 25 - 30 minutes or until golden brown.  Cool on a wire rack before cutting.
Yield: 3 dozen