1 ½ cups peanut butter

1 cup plus 2 tablespoons brown sugar

1 ¾ cups powdered sugar

¼ cup melted butter

¼ cup butter

1 cup chocolate chips

Mix together peanut butter, brown sugar, powdered sugar and melted butter; spread in a 9×13-inch pan.  Melt remaining butter and chocolate chips; spread over all. Refrigerate.