Chocolate Peanut Butter Bars

1 1/2 C butter, melted
2 C peanut butter
4 1/2 C confectioner's sugar
2 C graham cracker crumbs

1/2 C butter
2 C semi-sweet chocolate chips

Grease a 10x15 inch pan. In a large bowl, combine 1 1/2 C melted butter, peanut butter, confectioner's sugar, and graham cracker crumbs. Spread in prepared pan.

Combine 1/2 C butter and chocolate chips in a medium saucepan over medium-low heat. Stir occasionally until melted and smooth. Spread over peanut butter mixture. Let cool completely before cutting into bars.