TheFork users who ate in Chartres have said really good things about Le Shalimar, Le Tripot and Crêperie des 3 Lys. Maybe you should give them a try!
Some of the more popular Vegetarian dishes restaurants that offer vegetarian options on their menu in Chartres according to TheFork users include:
Le Shalimar, with a 9.1 rating
Le Tripot, with a 9.4 rating
Crêperie des 3 Lys, with a 8.8 rating