1 c. butter, melted
1 1/3 c. peanut butter
3 c. powdered sugar
2 c. graham cracker crumbs
12 oz. semi-sweet chocolate chips, melted

Mix butter and peanut butter. Add powdered sugar and mix. Add crumbs and mix. Press into 11 x 17 inch pan. Pour melted chocolate over. Freeze 15 minutes. Cut in bars and serve.