Preheat your oven to 375°F (190°C).

In a large pot, cook the pasta according to package instructions until al dente. Drain and set aside.

In a large skillet, heat olive oil over medium heat. Add diced onion and cook until translucent, about 3-4 minutes. Stir in minced garlic and cook for an additional 1 minute.

Add ground beef to the skillet, breaking it apart with a spoon. Cook until browned and no longer pink, about 5-7 minutes. Drain excess fat if necessary.

Stir in tomato sauce, diced tomatoes, Italian seasoning, salt, and black pepper. Let the mixture simmer for about 5 minutes.

In a large mixing bowl, combine the cooked pasta with the beef mixture. Stir until well combined.

Transfer the pasta and beef mixture to a greased 9x13 inch baking dish. Top with shredded mozzarella and grated Parmesan cheese.

Bake in the preheated oven for 20-25 minutes, or until the cheese is melted and bubbly.

Remove from the oven and let it cool for a few minutes. Garnish with fresh basil leaves if desired before serving.