INGREDIENTS
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2 cups plus 3 tablespoons all-purpose flour
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3/4 teaspoon kosher salt
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3/4 teaspoon baking soda
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2 sticks unsalted butter, at room temperature
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1 cup granulated sugar
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1/3 cup dark brown muscavado sugar
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1/3 cup light brown muscavado sugar
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2 large eggs
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1 1/2 teaspoons pure vanilla extract
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1 (5-ounce) block semisweet chocolate, chopped into chunks (recommended: Callebaut)
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1 (5-ounce) block milk chocolate, chopped into chunks (recommended: Callebaut)