In a medium bowl, mix together the melted butter, graham cracker crumbs, confectioners’ sugar, and 1 cup peanut butter until well blended. Press evenly into the bottom of an ungreased 9×13 inch pan.
2
In a metal bowl over simmering water, or in the microwave, melt the chocolate chips with the peanut butter, stirring occasionally until smooth. Spread over the peanut butter layer.
3
Refrigerate for at least one hour before cutting into squares.