TheFork users who ate in Aulnay-sous-Bois have said really good things about La Cantina, Il Capriccio and Casa Carina. Maybe you should give them a try!
Some of the more popular Pizzeria restaurants that offer vegetarian options on their menu in Aulnay-sous-Bois according to TheFork users include:
La Cantina, with a 7.6 rating
Il Capriccio, with a 9.3 rating
Casa Carina, with a 7.6 rating