This Confetti Birthday Cake, also known as Funfetti, is a moist and fluffy celebration cake studded with vibrant rainbow sprinkles inside and out. Made with a tender cake flour base, buttermilk, and a rich vanilla buttercream frosting, this multi-layered vanilla cake is perfect for birthdays and special occasions. The cake layers are baked to golden perfection and finished with a smooth, creamy frosting generously garnished with additional sprinkles for a playful touch.