Grease crockpot with cooking spray. Place all ingredients into crockpot and stir to combine. Cook on high for 4 hours, or low for 8 hours. Remove chicken breasts from crockpot and, using two forks, shred them and return them to the crockpot. Stir to combine. Serve! Optional: serve with green onions, cilantro and/or plain Greek yogurt.