INGREDIENTS
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1 cup (2 sticks) unsalted butter, at room temperature
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1 cup packed light brown sugar
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1/2 granulated white sugar
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1 large egg
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1 large egg yolk
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1 tablespoon vanilla extract
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2 cups all-purpose flour
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1 cup oats
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1 teaspoon baking powder
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1 teaspoon baking soda
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1 teaspoon kosher salt
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3 cups semi-sweet or milk chocolate chips