INGREDIENTS
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Vegetable oil cooking spray
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1 1/4 cups cake flour
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1/2 cup unsweetened Dutch-process cocoa plus 1 teaspoon for dusting
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1 teaspoon baking soda
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1 1/2 cups granulated sugar
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1/2 ounce unsweetened chocolate, coarsely chopped
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4 tablespoons unsalted butter
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1 cup low-fat (1.5%) buttermilk
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1 tablespoon pure vanilla extract
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2 large eggs
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1 large egg white
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1 teaspoon confectioners' sugar