INGREDIENTS
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2 2/3 cups unbleached all-purpose flour
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2 cups sugar
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1/3 cup unsweetened cocoa powder
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2 1/4 teaspoons baking soda
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1/2 teaspoon ground cinnamon
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3/4 teaspoon salt
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1 1/2 sticks (6 ounces) unsalted butter, softened
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1 1/3 cups sour cream
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3 ounces unsweetened chocolate, melted and slightly cooled
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3 eggs
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1 1/2 teaspoons vanilla extract