Make the BBQ Chicken: Add the chicken breast, barbecue sauce, water, apple cider vinegar, and salt to your crockpot. Stir to combine. Cook on high for 2-3 hours until the chicken breast is cooked through and shreddable. Use two forks to shred the chicken breast in the barbecue sauce.
Make the Cilantro Ranch: Add the ranch dressing ingredients to a high-powered blender and blend until smooth and creamy.
Assemble your salad: Start with romaine lettuce and top with the barbecue chicken, corn, black beans, tomatoes, avocado, and red onion. Drizzle the cilantro ranch dressing and extra drizzle of bbq sauce over everything and serve. Enjoy!