INGREDIENTS
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2 1/4 cups all-purpose flour, plus more for the work surface 3/4 teaspoon baking soda
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3/4 teaspoon fine sea salt or table salt
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2 sticks (8 ounces) unsalted butter, at room temperature
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3/4 cup packed dark brown sugar
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3/4 cup granulated sugar
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4 large egg yolks, at room temperature
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1 teaspoon vanilla extract
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9 ounces bittersweet chocolate (stashed in the freezer for ease of chopping)
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1 large egg, lightly beaten, for brushing (optional)
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1/4 teaspoon fleur de sel, for sprinkling (optional)