Add the chicken to the bottom of a slow cooker and cover with salsa. Cook on "low" for 6-8 hours.
Use two forks to break up the chicken into bite-sized shreds.
Stir in the pepper & onion mixture, chicken broth, and spices, and cook for an additional 30 minutes on "high". Feel free to add more liquid to your preference.
Serve hot, topped with avocado or cilantro, or just as it is! Enjoy!