Name: The Whiteout Cake: White Layer Cake with White Chocolate Frosting
Ingredients: 2 1/2 cups of cake flour; 3/4 cup all-purpose flour; 1 tablespoon baking powder; 1 teaspoon baking soda; 3/4 teaspoon salt; 1/2 cup 1 stick unsalted butter, softened; 1/2 cup vegetable shortening; 1 3/4 cups sugar; 1 tablespoon pure vanilla extract; 1 large egg; 1 1/2 cups ice cold water; 3 large egg whites (at room temperature); 1/4 teaspoon cream of tartar; 6 ounces white chocolate (coarsely chopped); 1 1/2 cups sugar; 1/3 cup all-purpose flour; 1 1/2 cups milk; 1/3 cup heavy cream; 1 1/2 cups 3 sticks unsalted butter, soft but cool, cut into small pieces; 1 teaspoon pure vanilla extract