"A cookie with a thick and chewy texture. ...."
INGREDIENTS
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2 1/2 cups all-purpose flour
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1 1/2 cups cake flour
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2 teaspoons cornstarch
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1 teaspoon baking powder
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1 teaspoon baking soda
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1 teaspoon fine salt
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1 cup unsalted butter, room temperature
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1 cup packed light brown sugar
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1/2 cup granulated sugar
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2 large eggs, room temperature
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2 large egg yolks, room temperature
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2 cups semi-sweet chocolate chips
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8 ounce chocolate bar (for eating), roughly chopped
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1/2 cup roughly chopped walnuts (optional)