INGREDIENTS
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2 1/4 cups all-purpose flour
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1 teaspoon baking soda
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2 teaspoons cornstarch
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1/2 teaspoon salt
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3/4 cup packed brown sugar
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1/2 cup granulated sugar
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3/4 cup unsalted butter, melted
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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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1 cup semi-sweet chocolate chips plus more for topping