1. Preheat the oven to 375°F.
2. Cook the rigatoni pasta in salted boiling water until al dente, then drain and set aside.
3. In a large skillet, cook the ground beef over medium heat until browned.
4. Add chopped onions and minced garlic to the skillet and sauté until softened.
5. Stir in crushed tomatoes, tomato sauce, Italian seasoning, basil, oregano, salt, and pepper.
6. Let the meat sauce simmer for about 20-30 minutes to develop flavors.
7. In a large baking dish, spread a layer of meat sauce on the bottom.
8. Add half of the cooked rigatoni pasta over the sauce.
9. Sprinkle a layer of mozzarella cheese and Parmesan cheese on top.
10. Repeat with another layer of meat sauce, rigatoni, and cheeses.
11. If using, pour bechamel sauce over the top for extra creaminess.
12. Cover the dish with foil and bake for 25-30 minutes until bubbly.
13. Remove the foil and bake for an additional 5 minutes to brown the cheese slightly.
14. Let the baked rigatoni rest for a few minutes before serving.
15. Garnish with fresh basil or parsley for extra flavor.
16. Serve hot and enjoy this hearty, comforting dish.
17. Store leftovers in an airtight container and reheat as needed.