INGREDIENTS
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4.5 ounces all-purpose flour (about 1 cup)
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1 1/4 cups powdered sugar, divided
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1/4 cup unsweetened cocoa
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1 1/4 teaspoons baking powder
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1/8 teaspoon salt
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5 1/4 teaspoons canola oil
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1 1/2 ounces unsweetened chocolate, chopped
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1 teaspoon instant espresso granules
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3/4 cup packed brown sugar
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3 tablespoons light-colored corn syrup
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1 1/2 teaspoons vanilla extract
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2 large egg whites