INGREDIENTS
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1 1/2 cups unbleached all-purpose flour
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1 1/2 teaspoons baking powder
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1/4 teaspoon salt
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3/4 cup (1 1/2 sticks) unsalted butter
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1 1/2 cups firmly packed light brown sugar
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1 large egg
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1 large egg yolk
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1 teaspoon pure vanilla extract
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16 mini peanut butter cups
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1 cup M&M's