INGREDIENTS
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8 tablespoons (4 ounces) butter, softened but still cool
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3/4 cup (6 1/4 ounces) firmly packed dark brown sugar
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1/2 cup plus 1 tablespoon (4 ounces) granulated sugar
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1 large egg (1 1/2 ounces by weight)
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1 teaspoon pure vanilla extract
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1 teaspoon kosher salt
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1 1/4 cups plus 3 tablespoons (7 ounces) all-purpose flour
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1/2 teaspoon baking soda
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1/4 teaspoon baking powder
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8 ounces bittersweet chocolate, chopped the size of chocolate chips, or bittersweet chocolate chips (about 1 1/2 cups)
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3/4 cup (3 ounces) chopped walnuts, optional