Combine all ingredients (besides serving and topping ingredients) in a slow cooker. Stir to combine. Cook on high for 3-4 hours or low for 6-8 hours.
Once chicken is fully cooked, remove from slow cooker and shred with two forks. Place shredded chicken back into the slow cooker with sauce, stir and cook on low for 15 more minutes.
Serve heaping spoonfuls over cooked rice or warm tortillas.