INGREDIENTS
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1 box white cake mix
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4 egg whites
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1/3 cup oil
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1 cup buttermilk
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1/2 cup sour cream
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1/4 cup mayonnaise
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1 tablespoon vanilla extract
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Double Berry Buttercream
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2 tablespoons freeze dried strawberries, pulverized in the food processor
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2 tablespoons freeze dried raspberries, pulverized in the food processor
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1 cup butter, softened
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1 teaspoon vanilla extract
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4-5 cups powdered sugar
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milk, if needed