In a large saucepan, heat oil over medium heat. Add peppers, mushrooms, onion,celery, and garlic. Cook about 7 minutes until vegetables begin to soften. Add seasonings and continue to cook an additional 5 minutes, stirring occasionally.
Add beans and tomatoes with all their juices and bring to a gentle simmer. Simmer 25 to 30 minutes, until chili is fragrant and slightly thickened.