In a large mixing bowl mix the ground beef with salt and pepper to taste, ketchup, mustard, dried oregano, dried onion powder, garlic powder, egg, oregano, breadcrumbs, and grated cheese.
Form small meatballs and fry them in a nonstick frying pan over medium heat for about 5 minutes.
Grease a casserole pan with butter and pour the tomato sauce over.
Arrange the meatballs in the casserole pan and top with grated cheese.
Bake in an already heated oven at 350 F or 180 C degrees for about 25 minutes.
Serve and enjoy with freshly chopped parsley.