1 c. butter, melted
1 3/4 c. graham cracker crumbs
2 1/4 c. powdered sugar
1 2/3 c. peanut butter
1 (12 oz.) semi-sweet chocolate, melted

Melt butter; add graham cracker crumbs. Cool and add sugar and peanut butter. Spread in 9 x 13 inch pan. Top with melted chocolate. Cool slightly, then cut into bars and refrigerate. (Do not cool completely before cutting or they will be too difficult to cut, just let the chocolate harden enough to make it easier to cut.)