Verified answer

It's "Nous avons déjeuné!"

Good luck!... ☺

I believe your answer is correct! Also, dejeuner is a verb, so you can say: nous avons dejeune (with the accent) or nous avons deja dejeune (still need the accent). But I don't really know if the French say it like that, or what's "normal" to them. Technically, you could say it lots of different ways.

Nous avons Deja manger le dejuener or nous avons Deja eu le dejeuner

Google translate says that its nous avons dejeune but i think its nous avons eu le dejeuner