Creating Three Cheese Baked Ziti is a simple yet rewarding process. Follow these steps for a delicious result:

1. Preheat Oven: Start by preheating your oven to 375°F (190°C).
2. Cook Pasta: In a large pot of salted boiling water, cook the ziti or penne according to package instructions until al dente. Drain and set aside.
3. Sauté Vegetables: In a large skillet, heat olive oil over medium heat. Add chopped onion and cook until translucent, about 5 minutes. Stir in the minced garlic and cook for an additional minute.
4. Add Sauce: Pour in the marinara sauce and stir to combine. Allow to simmer for about 5 minutes, seasoning with salt, pepper, and dried Italian herbs.
5. Mix Cheeses: In a separate bowl, combine the ricotta cheese and half of the mozzarella cheese. Season with salt and pepper to taste.
6. Combine: In a large mixing bowl, combine the cooked pasta with the sauce mixture. Stir until the pasta is well coated.
7. Layer Ingredients: In a greased baking dish, spread half of the pasta mixture. Top this layer with dollops of the ricotta mixture, then add the remaining pasta on top. Finally, sprinkle the remaining mozzarella cheese and all the Parmesan cheese over the top.
8. Bake: Place the baking dish in the preheated oven and bake for 25-30 minutes, or until bubbly and golden brown on top.
9. Cool: After baking, let the dish cool for about 5-10 minutes before serving to allow it to set.
10. Garnish and Serve: For an optional touch, sprinkle fresh basil or parsley on top before serving.

These steps will guide you in preparing this incredible dish effortlessly, ensuring it turns out perfectly every time.