Place oil in a large pot and place over medium high heat. Add in onion, garlic, salt and pepper and saute for 5 minutes, stirring frequently.Next add in remaining ingredients (sweet potato, carrots, stewed tomatoes, tomato sauce, beans, chili powder, cumin, cayenne pepper, broth and Worcestershire sauce); stir for about 20 seconds. Bring to a boil, then reduce heat and simmer uncovered for 30-45 minutes or until chili thickens and flavors come together.Taste and adjust seasonings and salt as necessary. Garnish with anything you'd like (such as avocado, diced red onion, jalapeno, cilantro or lime slices).Store leftovers in an airtight container in your refrigerator for up to five days.