Place chicken in a 3-4 quart slow cooker with 1-2 cups of water, cover and cook on low heat for 4-6 hours.
2. Remove chicken from cooker using a slotted spoon and drain the water from the slow cooker. Place chicken on a cutting board and pull chicken into shreds, discarding any fat.
3. Place chicken back in the cooker and pour dressing, Parmesan cheese, parsley, and pepper over the top. I really make sure that I discard any fat pieces so by the time I was done I only used about 1/2 cup of dressing but you make need more if you have more chicken. Stir until mixed evenly. Cover and cook on high heat for 30 minutes or until mixture is hot.
4. Spoon 1/4 cup mixture onto each slider bun if you are making sliders or more for regular sized buns. Top with extra shredded Parmesan cheese and lettuce to serve.