[bigiain]

This made me wonder what a poffert is, if a poffertje is a cute baby version of them. So I Googled it. Sure enough, it's a cake.

[qsi]

That would be a poffer, as the interstitial t is added to words ending in r when forming the diminutive.

And no, I didn't know what a poffer was either. :)

[Doxin]

Looking it up a poffer is a kind of hat, and a poffert is a kind of cake. "Poffert" is definitely an odd word though.

[SideburnsOfDoom]

That would be a "puffer" or light, fluffy cake.