1. Place the meat in a large mixing bowl.
2. Add the onion, oats, parsley, pepper, mustard, brown sugar and tomato soup;
3. Mix ingredients together well.
4. Prepare a baking pan with the cooking spray.
5. Preheat the oven to 350 degrees.
6. Place the meat into the prepared pan.
7. Bake 55 minutes.
8. Allow to stand a few minutes before cutting.