Heat the olive oil in a pan over medium-high heat. Add the chicken and cook for 5-7 minutes per side until browned and fully cooked. Transfer to a cutting board and shred.
Add all ingredients, except the parsley, to the slow cooker.
Mix cornstarch and water to form a slurry. Pour into the slow cooker.
Cover with the lid and cook on low for 6-8 hours or on high for 3-4 hours.
Season with more salt and pepper to taste. Remove bay leaves and serve hot with a garnish of parsley.