Grease the insert of a large 7 quart slow cooker. Add all the ingredients to the slow cooker except the chicken. Stir well to combine. Then place the raw chicken breasts into the bottom.
Cover with lid and cook on low heat for 4 hours, or until chicken is cooked through (165 degrees F.)
Carefully remove chicken and shred on a clean butting board. Place back into slow cooker and stir to combine.
Serve soup in individual bowls with your favorite toppings. We like cheese, sour cream, tortilla chips, green onion, cilantro, etc. Enjoy!