"This brownie is outstanding. It's moist all the way to the edges, with a deep, dark, rich chocolaty essence...."
INGREDIENTS
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8 ounces bittersweet (60% cacao) chocolate, chopped
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1 stick (1/2 cup) plus 3 tablespoons unsalted butter plus more for pans
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1 cup packed light brown sugar
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3 large eggs
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1 teaspoon pure vanilla extract
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1/4 teaspoon salt
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2/3 cup all-purpose flour
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Special equipment: A 9-inch square baking pan; parchment paper