Preheat oven to 300°. Mix beef, oatmeal, onion, celery, carrot, eggs, milk, salt and pepper together in a bowl. Roll into 1 1/2?2 inch meatballs and place in a 9-by-13 inch dish sprayed with cooking spray. Mix together brown sugar and ketchup; spoon over meatballs. Cover baking dish with foil, and bake for 1 hour. Serve as an appetizer, over pasta or on a hoagie bun.
This recipe won second place in the ground-beef category at Wooster Home and Garden Show.