French Spaghetti

1 lb. ground beef
1/4 cup olive oil
1 Medium onion
1/2 lb. mushrooms
2 cans - 15 oz. tomato sauce
1/2 lb. American cheese - cut up
3/4 cup black olives
1 tsp. salt
1 tsp. pepper
1/2 lb. spaghetti - cooked

Brown meat in olive oil.  
Add onion and mushrooms.  
Cook 10 minutes.  
Stir in tomato sauce, cheese and olives till cheese melts.  
Add salt and pepper.  
Stir all into cooked spaghetti.  
Put into greased casserole and sprinkle with parmesan cheese and dot with butter.

350 degree oven for 30 minutes.