In dutch oven or stock pot heat avocado oil over medium heat. Saute onion until soft and translucent. Add minced garlic. Cook for a minute longer.
Stir in fire roasted tomatoes, green chilies, chicken broth, corn, black beans and seasonings. Continue to cook over medium heat for 15 minutes.
Stir in cooked chicken. Cook for an additional 5 minutes or until heated through.
Serve soup with avocado, tortillas strips and fresh sour cream.