Mine are both round and flat bottomed as well as iced and powdered. So, you CAN have it both ways.
Early this a.m. I mixed a new batch of PFNs, using a Joy of Cooking recipe. It's chilling now, and it looks promising.
Let me know how that goes Anonimo. I've been trying to think of something I could make for my friend's Christmas party. I would love to have pfns. (nice job on the abbreviation, btw)

Good luck Anonimo. More flour. Go for Silly-Putty stiffness as you form the ropes before chilling, not PlayDoh.
They are out of the oven. Although they flattened somewhat, they are better as well as tastier than those of the previous recipe.
Pfactors apffecting the outcome are, IMO, too much hygroscopic sweeteners, such as honey; adding brandy to the dough; and could be altitde (we are at almost 7000 ft a.s.l.
We can eat these, though, without shame.