Preheat the Oven: Set it to 375°F (190°C) to get ready for the magic to happen.
Pasta Prep: Boil Mostaccioli in salted water until al dente, then drain.
Sauté: In a skillet, heat olive oil and cook the onion and garlic until soft.
Brown the Meat: Add your choice of meat to the skillet, cooking until no pink remains. Drain any excess fat.
Simmer the Sauce: Add the marinara sauce to the meat, letting the flavors blend for a few minutes.
Combine: Toss the cooked pasta with the sauce, half the mozzarella, and half the Parmesan.
Bake: Transfer to a baking dish, top with the remaining cheese, and sprinkle with Italian seasoning. Bake for 25 minutes or until the cheese is bubbly and golden.
Rest and Serve: Let the dish cool slightly before serving, garnished with fresh basil if desired.