Season chicken with salt and pepper and place chicken in slow cooker.
Sauté the onion in 1 tablespoon olive oil, until the onion is clear, adding minced garlic for the last 20 seconds.
Add onion and remaining ingredients to slow cooker.
Cover and cook on low for 6 hours or high for 4 hours.
30 minutes before cooking time is finished, shred chicken with two forks and return to slow cooker. Stir to mix, place lid back on and cook for remaining 30 minutes.
If too thick you can add a little more broth to your desired consistency.
Serve with sliced avocado's, fresh cilantro, lime wedges, sour cream, shredded cheese and tortilla chips.
Notes
Store any leftovers in the refrigerator in an airtight container for up to 3 days.