INGREDIENTS
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1 cup (2 sticks) unsalted butter, room temperature
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9 ounces bittersweet chocolate, reserve 2 tablespoons for sprinkling (You can also use milk chocolate)
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3/4 teaspoon fine sea salt or table salt
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3/4 teaspoon baking soda
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2 1/4 cups all-purpose flour, plus more for work surface
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1 teaspoon pure vanilla extract
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4 large egg yolks, room temperature
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3/4 cup granulated sugar
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3/4 cup packed dark-brown sugar
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1 large egg, lightly beaten