What is 'chef' when translated from English to Italian?

In Italian, cook dinner is "fare cena". But the verb "fare" is conjugated as follows:

Io faccio cena - I cook dinner

Tu fai cena - You cook dinner

Lei/lei/lui fa cena - You (formal)/she/he cooks dinner

Noi facciamo cena - We cook dinner

Voi fate cena - You (plural) cook dinner

Loro/loro - You (plural formal)/they cook dinner