2 hamburger buns, split
1/2 lb. ground beef
2 tbsp. grated Parmesan cheese
2 tbsp. onion, chopped
1/2 tsp. salt
1/2 tsp. oregano
1/4 c. catsup
1 to 2 slices Mozzarella cheese, cut in 1/2 inch strips

Toast buns in 350 degree oven. Brown hamburger and drain off fat. Combine meat and other ingredients except Mozzarella cheese. Add enough catsup so meat sticks together. Spread mix on toasted buns. Place strips of Mozzarella cheese on top and more Parmesan cheese. Bake in 350 degree oven for 5 to 10 minutes, just until cheese melts.