Preheat your oven to 375°F (190°C) and cook the ziti pasta according to package directions until al dente, then drain it well.

In a large bowl, combine the ricotta cheese, egg, chopped fresh parsley, salt, and black pepper, mixing until everything is well incorporated.

Spread a thin layer of marinara sauce on the bottom of a 9x13 inch baking dish.

Add half of the cooked ziti to the baking dish, followed by half of the ricotta cheese mixture dolloped over the pasta.

Sprinkle half of the shredded mozzarella cheese and a quarter cup of Parmesan cheese over the ricotta layer.

Pour half of the remaining marinara sauce over the cheese, then repeat the layers with the remaining ziti, ricotta, mozzarella, and Parmesan cheese.

Cover the baking dish with aluminum foil and bake for 30 minutes, then remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden brown.

Let the baked ziti rest for 10 minutes before serving to allow it to set.