Just sub the meat for mushrooms and/or tofu.
Chickpeas, lentils and TVP are also acceptable additions.
I've done fried tofu chili before and it was legitimately good.
Don't let the retard brigade get you down. YES, chili IS technically a beef stew, but you can still make a really, really good vegetarian chili . . . If you know how to cook.

But you're posting on /ck/ asking for basic bitch advice, so it's pretty apparent that you can't. So just get a can.