My very veggie chilli is similar to Pb's and Courtney's. I don't roast the veggies but that would make it even tastier! I always start with frying chopped onion up in a bit of oil and add whatever veggies I have--usually celery, green beans, carrots, peppers and mushrooms. Anything can go in--I've used broccolli and cabbage (chopped up really small) as well--whatever needs using up.
Then cumin, cinnamon, chili powder (or fresh chilis), salt, sometimes paprika, a bit of dark chocolate if I have any. A couple tins of tomatoes, whatever beans I've got.
Hubby usually un-veggies his by cooking up some diced turkey or chicken to add to his. I sometimes add chopped up veggie sausages or veggie chicken pieces to mine.
It's really easy to make!