Preheat your oven to 375°F (190°C).

Cook the ziti pasta according to package instructions until al dente. Drain and set aside.

In a large skillet over medium heat, combine the ground beef, Italian sausage, diced onion, and minced garlic. Cook until the meat is browned and the onions are translucent, about 6-8 minutes. Drain any excess fat.

Stir in the marinara sauce along with the oregano, basil, salt, and pepper. Let it simmer for 5 minutes.

In a large bowl, mix the ricotta cheese, half of the Parmesan, and 1 cup of mozzarella cheese.

In a greased large baking dish, spread a layer of meat sauce on the bottom. Top with half of the cooked ziti and then half of the ricotta mixture. Repeat layering with remaining meat sauce, ziti, and ricotta mixture.

Top with remaining mozzarella and Parmesan cheese.

Cover with aluminum foil and bake for 25 minutes. Remove foil for the final 15 minutes.

Let it sit for about 10 minutes before serving. Garnish with fresh basil leaves if desired.