01 -
Place the chicken breasts or thighs at the bottom of the slow cooker.
02 -
Season the chicken evenly with salt, black pepper, ground cumin, and dried oregano.
03 -
Pour the green enchilada sauce and chicken broth over the chicken. Add diced green bell pepper, onion, tomatoes if using, diced green chilies, and minced garlic.
04 -
Cover and cook on low for 6 to 8 hours or on high for 3 to 4 hours until the chicken is thoroughly cooked and tender.
05 -
Remove the chicken from the slow cooker carefully and shred it with two forks.
06 -
Return shredded chicken to the pot and stir thoroughly to integrate all flavors.
07 -
Taste the soup and adjust salt and black pepper as needed.
08 -
Ladle soup into bowls and garnish with shredded cheddar cheese and chopped fresh cilantro if desired.