INGREDIENTS
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1/2 cup unsalted butter
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1/2 cup light brown sugar, lightly packed
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1/2 cup granulated sugar
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1/2 cup creamy peanut butter
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1 large egg
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1/2 teaspoon vanilla extract
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1/2 teaspoon salt
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1/2 teaspoon baking soda
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1 cup all-purpose flour (plus 1 to 2 tablespoons more as needed)