The Whiteout Cake Recipe | Say Mmm

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