2 sticks butter
1 lb. powdered sugar
1 c. peanut butter (smooth or crunchy)
1 1/2 c. graham cracker crumbs
1 lg. chocolate chips

Melt butter, mix in powdered sugar, peanut butter and cracker crumbs. Spread into 9x13 pan. Melt chocolate chips and spread over mixture. Let set until firm. Cut into squares.