In a large bowl, combine stuffing, onion, celery and parsley. In a small bowl, beat the egg; stir in broth and the melted butter. Pour over stuffing mixture. Sprinkle with seasoned salt and pepper; mix well.
Pound steak to 1/2 inch thickness. Spread 1 1/2 cups stuffing mixture over steak. Roll the steak up starting with the short side; tie with cooking string. Place in a 5 quart slow cooker. Any remaining stuffing can be wrapped tightly in foil and placed over the rolled steak. Cover and cook on low for 6 to 8 hours. (Since I work it cooks for almost 8 hours). Remove the string before slicing.
I love my slow cooker as it allows me to make great meals during a work week!!!!