Preheat the oven to 350 degrees.
Boil the noodles according to package directions until tender. Drain and set aside.
Cook the Italian sausage over medium heat in a large skillet, breaking it apart as it cooks, until browned.
Pour enough sauce to cover the bottom of the casserole dish.
In a large bowl, combine the cooked Italian sausage, ricotta, parmesan, half the mozzarella, seasonings, and 2 cups of the sauce.
Fill the shells with the mixture, and set them into the prepared casserole dish.
Pour sauce over the stuffed shells, then top with the remaining mozzarella cheese.
Cover the casserole dish with foil, and bake for 30 minutes.
Uncover and bake for an additional 20-30 minutes, until the cheese is melted. You can broil for 2-3 minutes on high to get the cheese nice and bubbly.
Chop some fresh parsley and sprinkle it over the dish before serving.