INGREDIENTS
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2 ¼ cup all-purpose flour
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1 ½ tsp cornstarch
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1 tsp baking soda
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½ tsp salt
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¾ cup unsalted butter
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¾ cup light brown sugar, loosely packed
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½ cup granulated sugar
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1 large egg + 1 egg yolk
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2 tsp vanilla extract
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1 cup dark chocolate chips