Exotic Kit Kat flavors are commonplace in Japan, but this flavor tops them all in the fact that it requires an extra step before consuming: baking! Baked cheesecake Kit Kat come in a wrapper with instructions on how to prepare it in your toaster oven (because every Japanese household has a toaster oven). In one to two minutes, watch the top turn a bubbly golden brown, then remove and eat. I must admit, this is one amazing treat to eat warm from the oven. This flavor is currently one of the core flavors in Japan meaning you can find it in most supermarkets.