Spray a 3-quart baking dish. Cook pasta according to package directions but slightly undercooking; drain. In a medium bowl combine pasta sauce and Italian seasoning. Remove 2 cups and set aside. Stir remaining sauce into cooked pasta.
Place half of the pasta mixture in baking dish. Sprinkle 1 cup of the mozzarella cheese on top.
In a medium bowl, beat egg and stir in ricotta, Parmesan, parsley, and salt until blended.
Place over the mozzarella cheese by dolloping with a spoon and gently spread. Top with remaining pasta, then sprinkle with 1 cup of the mozzarella cheese. Spread remaining pasta sauce evenly to edges of dish, coating all pasta.
Bake, uncovered, in a preheated 350°F oven for 30 minutes or until very hot in center and edges are bubbly.
Sprinkle with remaining mozzarella cheese. Bake 3 to 5 minutes longer or until cheese melts.
Cheesy Baked Ziti freezes well, so if you'd like you can double the recipe and put one in the freezer. Don't put the shredded cheese topping on before freezing—put it in a separate bag or container and place it under the wrapping so that it is handy when you are ready to bake the dish. Label with:Cheesy Baked Ziti: Thaw. Bake uncovered in a preheated 350°F oven for 30 minutes. Sprinkle with remaining mozzarella cheese. Bake 3 to 5 minutes longer or until cheese melts.