My only complaint is that I'm used to hear "Oui Chef !" after each order of the chef in high end brigades.
So it felt very unnatural/odd to have a single "Oui".

But it was a nice episode.

Regarding the "Quiche", by its very nature it's not very surprising to replace major ingredients like lardons (minced bacon) with chicken.
After all the tart form and the apparel can accomodate for many ingredients, a bit like pizza even if in that case it did really get lots of combinations thanks to its worldwide popularity.
Salmon/spinach quiche is a nice combination for example.
For burdock/chicken, since chicken does not have a very strong flavor, I'd fear it would only serve as filer.
Lastly, as good as quiche is, you need to rework its presentation for a high end restaurant.