Cook sausage (breaking into small pieces as much as possible) until well browned … drain and set aside
Grease 13” x 9” baking dish with cooking spray
In bowl mix drained meat, ricotta, parmesan, parsley, egg, salt, pepper, and 2 cups red sauce
Prepare ziti al dente
Add ziti to mixture in bowl and toss gently to coat ziti
Scoop into greased baking dish and pour remaining sauce evenly over the top of the mixture. Sprinkle with mozzarella cheese.
Bake at 350° for 30-45 minutes until hot and bubbly