||Cook ziti according to package directions. Mix pasta and spaghetti sauce together in pot. In separate bowl mix ricotta cheese, egg, and parmesan together.
In 13×9 pan put layer of pasta mix on bottom, layer ricotta mixture, and then a final layer of pasta. Top entire casserole with 8oz mozzarella.
Cover with tin foil and cook it at 350 for 45 min. During the last 10 min of cooking take the foil off so the top can get bubbly and brown.