1 c. crunchy peanut butter
1 c. graham cracker crumbs
1 c. (2 sticks) butter, melted
1 lb. powdered sugar
2 c. semi-sweet chocolate pieces

Mix together the peanut butter, crumbs, butter and sugar. Pat this into a 13x9 pan. Melt the chocolate pieces and spread on top. Chill and cut into small pieces.