Tie Dye Cake - Snowy the Mouse

Ingredients

• 1/2 cup (1 stick) unsalted butter, softened, plus more for the pans
• 2 1/2 cups cake flour, plus more for dusting
• 3/4 cup all-purpose flour
• 1 tablespoon baking powder
• 1 teaspoon baking soda
• 3/4 teaspoon coarse salt
• 1/2 cup vegetable shortening, at room temperature
• 1 3/4 cups DOMINO Granulated Sugar
• 2 tablespoons pure vanilla extract
• 1 large egg
• 1 cup ice-cold water
• 1/2 cup whole milk
• 1/2 cup well-shaken buttermilk
• 1 cup sprinkles (assorted colors)
• 3 large egg whites, at room temperature
• 1/4 teaspoon cream of tartar
• 1 to 1 1/4 cups sprinkles, for decorating
• 6 large egg whites
• 1 1/3 cups DOMINO Granulated Sugar
• Pinch of salt
• 1 pound, plus 6 tablespoons (4 3/4 sticks) unsalted butter, cut into tablespoons, room temperature
• 1 3/4 teaspoons pure vanilla extract
• Desired food coloring