Coat ceramic insert of slow cooker with cooking spray, turn to high.
Add chicken breasts, combine remaining ingredients in mixing bowl, pour over chicken.
Cover with lid and cook for 6-8 hours on low or 3-4 hours on high.
Shred with 2 forks, place chicken back in the juices in slow cooker so it remains moist.
Serve on slider buns with a sprinkle of cilantro and cojita cheese.