Heat olive oil in a medium to large skillet then add the onions, carrots and celery for four minutes or until the vegetables start to soften. Add the bell pepper and sauté for another 2 minutes. Finally, add the garlic and sauté an additional minute.
Add the vegetables and all remaining ingredients to the slow cooker and stir to combine. Cover and cook on low for six hours.
Eat chili plain or add your favorite toppings such as: cheese, sour cream, onions, avocado or tomatoes.