Brown ground beef, drain. Saute onions and mushrooms until tender. Combine beef, onions, mushrooms and sauce. Set aside.
2
Place cottage cheese, eggs, and one cup mozzarella cheese into work bowl of food processor. Add seasoning (parsley, garlic, salt, pepper) if desired. Process until fairly smooth, about 45 seconds.
3
In 9x13 pan, place 1/3 of the meat sauce. Place 4 lasagna noodles over sauce. Spread 1/2 of the cottage cheese mixture over noodles. Next layer on the next 1/3 of the meat sauce, and repeat with 4 more noodles and rest of cottage cheese mixture. Finish with final 1/3 of sauce. Top with remaining mozzarella cheese.
4
Cover tightly with foil and bake at 350 degrees for 45 minutes or until hot and bubbly. Let stand for at least 15 minutes before serving.