In a large bowl, combine first 8 ingredients (butter through stuffing).
Place about 3 tablespoons of stuffing mixture on each turkey cutlet; roll up and secure with toothpicks.
Place rolls in a slow cooker; cover and cook on LOW for 6 to 8 hours or on HIGH for 3 to 4 hours.
LEANNE’S NOTE: If cutlets are too thick to roll, arrange them in the slow cooker and top with stuffing mixture. Or pound them flat first.