Finally, a delicious treat that will make taking a break a piece of cake. New KIT KAT® Birthday Cake – crisp wafers in birthday cake flavoured white crème with sprinkles. You’ll want to keep a few in your pantry and a few more at your workplace because you can always break for birthday cake. But, get ready, because KIT KAT® Birthday Cake flavoured candy bars will be available for a limited time only.