I don't know how long these contraptions have been around, but I barely had my first cake in a cup a month ago. This is pretty neat because it comes in packets and you pour them into the cup and put it in the microwave.
It's very easy to make and it's a small cake that you can eat from your cup. It's very convenient and pretty cool. The one that I have is the confetti cake in a cup. It tastes very good and I recommend it to anyone that likes small, quick desserts.