INGREDIENTS
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1 cup (2 sticks) unsalted butter, plus more for dish
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2/3 cup all-purpose flour, plus more for dish
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1/2 teaspoon salt
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12 ounces good-quality semisweet chocolate, coarsely chopped
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1 1/4 cups packed light-brown sugar
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4 large eggs
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1 tablespoon pure vanilla extract