"No membership card required...."
INGREDIENTS
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2 1/2 plus 2 tablespoons cake flour
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1 1/2 cups plus 2 tablespoons granulated sugar
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1 tablespoon baking powder
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3/4 teaspoon fine salt
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3/4 cup unsalted butter, very soft
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4 large egg whites, room temperature
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1 large egg yolk, room temperature
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1 tablespoon vanilla extract
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1 cup buttermilk, room temperature
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2 tablespoons water
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2 tablespoons cornstarch
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1 cup unsalted butter, very soft
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1/2 cup vegetable shortening, room temperature
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4 cups powdered sugar
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1/2 teaspoon fine salt
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1 tablespoon vanilla extract
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3 to 4 tablespoons whole milk or heavy cream, room temperature
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Copycat Costco Vanilla Mousse
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Sprinkles