Turn on crock pot to high to warm. I spray non stick cooking spray to sides and bottom or use a crock pot liner for easy cleanup. Add onion, bell pepper, celery, garlic, cumin, tomatoes, and broth. Add serrano(optional)
Add oil to pan and sprinkle salt and pepper over the chicken. Brown chicken on both sides. Once brown (about 5-8 minutes each side)with no pink outside, transfer to crock pot on top of other ingredients. Stir and water to 1 inch from the top of the crock pot and cover.
Cook in crock pot on high for 4 hours or cook on low for 6-8 hours.
Just before serving, remove chicken from soup and cut into smaller bite size pieces and return to soup. Add cilantro and cover for 10 minutes.
This is a healthy chicken soup when served as is. Sprinkle a few tortilla chips or if you prefer to go lean, cut up a corn tortilla into small bite size pieces and add to your hot soup.
Additional optional add-in ingredients include grated cheese, diced avocado, sour cream. Of course these all add to the caloric count of this soup. Hope you enjoy!