INGREDIENTS
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1 cups (2 sticks) unsalted butter, plus butter for greasing the baking pan (optional)
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Nonstick cooking spray (optional)
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3 ounces unsweetened chocolate
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1⁄2 cups unsweetened Dutch-processed cocoa powder
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2 1⁄2 cups granulated sugar
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1⁄2 teaspoons kosher or coarse salt
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1 tablespoons pure vanilla extract
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3 large eggs
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1 1⁄2 cups all-purpose flour