INGREDIENTS
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1 ¼ cups buttermilk, at room temperature, divided use
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½ cup vegetable oil
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5 large egg whites, at room temperature
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2 teaspoons vanilla extract
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2 ½ cups cake flour
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½ cup Splenda® Stevia Sweetener Jar
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1 tablespoon baking powder
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1 teaspoon salt
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½ teaspoon baking soda
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12 tablespoons (1 ½ sticks) unsalted butter, softened at room temperature