A great prepare ahead crock-pot meal!
In a pan, heat oil and add onion. Cook 3 minutes. Add the rest of the vegetables (carrots, celery, red pepper, garlic) cook an additional 3 minutes.
Place veggies in crock pot, top with chicken, spices, salt and pepper.
Pour 8 cups of stock and jar of tomatoes on top. Cover with lid and cook 6-8 hours on low.
After cooking is complete, remove chicken, shred it with two forks, then return to crock pot.
Add in the lime and fresh cilantro and stir well. Serve with more cilantro and fresh avocados on top.