1 (16 ounce) bottle Italian dressing (such as Olive Gardenâ„ Signature Italian Dressing)
1/4 cup grated Parmesan cheese
4 boneless skinless chicken breasts
Stir Italian dressing and Parmesan cheese together in a bowl.
Place chicken in a slow cooker, and pour dressing mixture over chicken. Cover and cook on Low until chicken is tender, no longer pink in the center, and the juices run clear, about 8 hours.