1. Combine browned and seasoned ground beef with the spaghetti sauce and the pizza sauce as well as the mini pepperoni.
2. Mix with the parboiled noodles, and layer half in a 9x9 or 10x13 baking dish. Sprinkle half of cheese on top, and layer half of pepperoni on this. Top with the rest of the pasta mixture, the remaining cheese, and the rest of the pepperoni. Sprinkle with parmesan cheese.
3. Bake at 325 for 30-40 minutes, or until bubbly and melted. If casserole starts to brown on top, cover with foil.
4. Remove and let cool for 10 minutes before serving.