Place chicken breasts in the bottom of a greased 7 quart slow cooker. Place all remaining ingredients over chicken. Stir to combine. Cover with lid and cook on low heat for 6 hours or high heat for 4 hours.
Carefully remove the hot chicken from slow cooker and place on a large plate or platter. Shred with two forks. Place shredded chicken back in slow cooker and stir to combine.
Serve soup warm with favorite toppings: cheese, tortilla strips, sour cream, etc. Enjoy!