BASE LAYER:

2 c. graham crackers, crushed
2 1/2 c. confectioners' sugar
2 c. peanut butter
2 sticks butter, melted

TOPPING LAYER:

1/2 c. butter
1 (12 oz.) pkg. chocolate chips

In bowl, mix base ingredients and press into buttered 9x13 inch pan. Melt topping layer ingredients in microwave and pour over peanut butter mixture. Chill 3 hours and cut into squares.