INGREDIENTS
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1 stick unsalted butter, at room temperature, plus more for the pan
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All-purpose flour, for the pan
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1 18.25-ounce box white cake mix, plus required ingredients
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1 cup creamy peanut butter
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1 1/2 to 2 cups confectioners' sugar
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2 to 3 tablespoons milk
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3/4 cup grape jelly