1 lb. hamburger
1 onion
1 lg. can tomato sauce
1/2 tsp. oregano
1/2 tsp. garlic salt
1/2 lb. spaghetti
1 sm. can mushrooms
1 c. shredded Swiss cheese
1 c. sharp Cheddar cheese

Cook beef and onion; drain grease. Add tomato sauce, salt and pepper, oregano, garlic salt, and mushrooms with juices. Simmer 15 minutes. Cook spaghetti and drain. Put 1/2 spaghetti mixture in 2 quart baking dish. Sprinkle with 1/2 each cheeses. Then add rest of mixture; top with rest of cheese. Bake at 375 degrees for 30 to 35 minutes.