Quickbreads, this wonder of humanity!
In fact, I would call these tiny guys cakes, because they are made with baking powder, not yeast.
And this is the reason why you can whip up a batch so fast.
They are great as last-minute snacks, for those times when someone comes over and you're not ready for it, to serve as an excuse to turn on the oven on chilly days, this kind of thing...
The recipe comes from a book a friend gave me last year, it's called "Marvellous mini cakes" by Ilona Chavancova.