INGREDIENTS
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1 cup (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 cup unsweetened Dutch-processed cocoa powder
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2 1/2 cups granulated sugar
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1/2 teaspoon kosher or coarse salt
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1 tablespoon pure vanilla extract
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3 large eggs
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1 1/2 cups all-purpose flour
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1/4 cup dark rum ( You could even go up to 1/3 cup)