I always love trying out the fun Japanese Kit Kat flavors, but this one was especially interesting with the interactive component to it. It's a pudding flavor (likely a Japanese flan, which is usually called "Purin"), which in itself isn't that unique, but there's also a big picture of a toaster oven on the front of the bag suggesting that you toast them!
Pudding flavored Kit Kats are already delicious, but the extra step of toasting them in the toaster oven adds a tasty touch to the bars. You definitely have to keep an eye on them to make sure they don't totally melt away/burn, but it's also sort of fun to see them brown and bubble up through the toaster oven window. It adds a slight caramel-y taste as well, like a quick and easy creme brulee. I'm so happy I got a chance to try these, and I hope they come out with more unique flavors and preparation ideas as well!