Brown ground beef, drain fat, add onion. Saute until onion is translucent.
Add spaghetti sauce, mix thoroughly.
In a separate bowl, combine cottage cheese, Parmesan, eggs, and Italian seasoning.
Preheat oven to 350̊ F.
In a 4 quart baking dish, spread about 1/3 of the sauce mixture. On top of sauce mix place ½ of the ziti. Next spread ½ of the cheese mixture. Add another 1/3 sauce mixture, layer the rest of the ziti. Layer the rest of the cheese mixture and top with the rest of the sauce mix.
Cover with foil and bake approximately 30 minutes until bubbly in center.