Arrange an oven rack to the lower third of the oven. Preheat oven to 350°F (177ºC) degrees.
Butter a piece of foil, long enough to cover 9X13 inch baking dish, on one side, or spray with nonstick cooking spray.
Pour 1 cup of sauce in the bottom of a 9X13 inch baking dish.
Cook ziti (16 ounces) according to box instructions, in water with 2 tablespoons of salt, until not quite al dente, (I cooked for 7 minutes). Drain pasta well. Dry pasta pot.
Return the well-drained ziti to the empty pasta pot and toss with all the remaining marinara sauce, and (1 tablespoon) dried Italian seasoning.
In a large mixing bowl, stir together ricotta cheese (24 ounces), 1 1/2 cups of mozzarella, 1 cup parmesan, beaten egg (2), fresh basil (1 cup), the remaining 2 teaspoons Italian seasoning, dried rosemary (1 1/2 teaspoons), nutmeg (1/4 teaspoon), salt (1/2 teaspoon) and pepper (1/2 teaspoon) until well combined; set aside.
Layer half the sauce coated pasta in the prepared baking dish.
Spread the cheese mixture over the pasta layer.
Top with remaining half of pasta then cover with prepared foil, butter side down on top of pasta. Bake until heated through and bubbly, about 35-40 minutes.
Remove from oven and remove foil. Sprinkle top with remaining 1 1/2 cups of mozzarella then 1 cup of parmesan. Return to oven and continue to bake until cheese is completely melted and golden brown. Let sit for 10-12 minutes before serving.