Brown ground beef with diced onion. Add salt and pepper to taste.
Add Ragu and mushrooms to meat. Stir to combine.
Cook 8 lasagna noodles in salted water until tender. Drain.
Grease 9x13” pan. Layer ⅓ of meat and sauce in bottom of pan. Top with 4 lasagna noodles. Add another ⅓ of meat and sauce, then 1 cup each of cheddar and mozzarella.
Spread 1 cup of cottage cheese over layers. Cover with 4 more lasagna noodles, then remaining meat and sauce. Top with remaining cheese.
Bake at 350° F for 45 minutes.