Put all ingredients (except the cheese, chips, avocado and sour cream) in the crock pot and cook on low for 6-8 hours. The longer the better. Take the chicken out toward the end, shred and put back in the pot. The longer it goes the better. Serve with shredded cheese, crushed tortilla chips, a dollop of sour cream and some fresh avocado slices on top. Enjoy.