INGREDIENTS
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1 1/2 sticks (12 tablespoons) unsalted butter, plus more for greasing the pan
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1 cup chunky peanut butter, such as Jif
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2 cups confectioners' sugar
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1 1/2 cup fine graham cracker crumbs
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1 cup butterscotch chips
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One 12-ounce bag semisweet chocolate chips