Cook the noodles and drain the water when noodles are done.
Mix the noodles with the sour cream and cottage cheese.
Brown the beef with the onion; drain the grease.
Add the tomato sauce, salt, pepper and garlic salt. Simmer for 5-10 minutes. In a casserole dish, put a layer of noodle mixture, then a layer of the beef mixture, then a layer of the cheddar and mozzarella cheeses.