1. Place beef mince, breadcrumbs, green onion, oregano and garlic in a large bowl and season to taste. Mix well to combine. Roll mixture inot 16 balls.
2. Spray a non-stick frying pan with cooking oil spray and heat on medium-high. Cook meatballs for 10 minutes, until browned and cooked through. Meanwhile heat passata in saucepan for 5 minutes, until warm. Transfer meatballs to a greased baking dish. Pour over passsata and scatter with cheese.