2 lbs. hamburger
1 med. jar green olives
1 can pizza sauce
1 (3 oz.) can Parmesan cheese
3/4 c. mayonnaise
1 sm. onion
1 sm. can mushrooms (optional)

Fry hamburger. Add all together in large bowl. Put on 1/2 of bun. Bake 10 minutes at 350 degrees. Add Mozzarella and bake 5 minutes more. Store in refrigerator or freezer.