INGREDIENTS
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Nonstick cooking spray
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2/3 cup all-purpose flour
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1/3 cup whole-wheat pastry flour
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3/4 cup packed light brown sugar
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1/4 cup Dutch processed cocoa powder, plus 2 tablespoons
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2 teaspoons baking powder
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1/2 teaspoon fine salt
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1 cup chocolate malt powder, such as Ovaltine
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1/2 cup low-fat (1 percent) milk
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1 large egg white
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2 tablespoons unsalted butter, melted
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2 teaspoons pure vanilla extract
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1 1/2 cups boiling water
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Confectioners' sugar, for dusting, optional