Copycat Costco Vanilla Cake

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INGREDIENTS
2 1/2 plus 2 tablespoons cake flour
1 1/2 cups plus 2 tablespoons granulated sugar
1 tablespoon baking powder
3/4 teaspoon fine salt
3/4 cup unsalted butter, very soft
4 large egg whites, room temperature
1 large egg yolk, room temperature
1 tablespoon vanilla extract
1 cup buttermilk, room temperature
2 tablespoons water
2 tablespoons cornstarch
1 cup unsalted butter, very soft
1/2 cup vegetable shortening, room temperature
4 cups powdered sugar
1/2 teaspoon fine salt
1 tablespoon vanilla extract
3 to 4 tablespoons whole milk or heavy cream, room temperature
Copycat Costco Vanilla Mousse
Sprinkles
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