1 stick butter, melted
2 c. confectioners' sugar
3/4 c. graham cracker crumbs
1 c. peanut butter
1/2 - 3/4 pkg. semi-sweet chocolate or regular milk chocolate chips

Mix all ingredients except for chocolate. Spread in 9"x9" greased pan. Melt chocolate chips and spread on top. Chill and cut into bars.