Line a 9-inch square pan with foil and butter the foil; set aside. In a large bowl, combine confectioners’ sugar, peanut butter, graham cracker crumbs and butter. Spread into prepared pan.
Combine topping ingredients in a microwave-safe bowl; heat until melted. Spread over peanut butter layer. Refrigerate until cool. Using foil, lift out of pan. Cut into 1-inch squares. Store in an airtight container in the refrigerator.
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