1Spray 3 1/2- to 4-quart slow cooker with cooking spray. Place onion and celery in cooker. Top with turkey breast half. Pour gravy and sherry over top. Top with dry stuffing.
2Cover and cook on low heat setting 6 to 7 hours or until turkey is no longer pink when center is cut.
3About 15 minutes before serving, remove turkey from cooker; place on cutting board. Stir stuffing and cooking juices until mixed. Cover and let stand 10 minutes. Cut turkey into slices; serve with stuffing.