"This velvety soft cake uses the reversed creaming method, and it has a perfect fine and moist crumb...."
INGREDIENTS
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2 cups cake flour
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1/2 teaspoon baking soda
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3/4 teaspoon baking powder
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3/4 teaspoon salt
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1 1/2 cups granulated sugar, divided
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1 cup sour cream, room temperature
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2 sticks (1 cup) unsalted butter, room temperature
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1 tablespoon canola or vegetable oil
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1 tablespoon pure vanilla extract
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6 large egg whites, room temperature
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1/2 teaspoon cream of tartar
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3 large egg whites
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1 1/4 cups granulated sugar
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5 tablespoons water
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1/4 teaspoon cream of tartar
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1 teaspoon pure vanilla extract