1. Heat olive oil in a large skillet over medium heat. Add diced onion and sauté until translucent, about 3 minutes. Add minced garlic and cook for 1 more minute.

2. Add ground beef to the skillet and cook until browned, breaking it apart as it cooks. Season with salt, pepper, and Italian seasoning.

3. Pour in tomato sauce and stir to combine. Let simmer for 5 minutes. Adjust seasoning if needed.

4. Cook pasta in salted boiling water until just al dente. Drain and set aside.

5. In a large bowl, mix the pasta with the beef and sauce mixture until well combined.

6. Grease a 9×13-inch casserole dish. Layer half the pasta mixture in the dish, then sprinkle half the mozzarella and parmesan over it.

7. Add the rest of the pasta mixture, followed by the remaining cheese on top.

8. Cover with foil and bake at 375°F (190°C) for 20 minutes. Remove foil and bake uncovered for 10 more minutes until the cheese is golden and bubbly.

9. Let rest for 5–10 minutes before serving. Garnish with fresh parsley if desired.