1 lb. hamburg
1/2 c. diced onion
1 tsp. garlic salt
1 sm. can tomato paste
1/2 tsp. oregano
1 sm. can mushrooms
1/2 c. sliced olives (optional)
1 c. shredded Mozzarella cheese
Hamburger buns

Brown hamburg and onions; drain off grease. Add garlic, tomato paste, oregano, mushrooms, and olives. Spread mixture on hamburg buns and top with cheese. Wrap in foil and cook in preheated 350 degree oven for 20-30 minutes.