INGREDIENTS
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1/2 cup (1 stick) butter, at room temperature, plus more for greasing pan
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1/2 cup granulated sugar
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1/2 cup light brown sugar, packed
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3/4 cup creamy peanut butter, divided
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1 large egg
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1 teaspoon vanilla extract
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1 cup all-purpose flour
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1 teaspoon baking soda
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1/4 teaspoon salt
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1/2 cup quick-cooking oatmeal
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1 cup butterscotch chips
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1 cup powdered sugar
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4 tablespoons milk
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