1 lb. ground beef
Onion
1 can tomato paste
1/2 tsp. salt
1 tsp. garlic powder
1/2 tsp. oregano
Monterey, Provolone or Mozzarella cheese

Brown ground beef with onion. Add remaining ingredients except cheese. Spoon mixture into buns and top with cheese. Wrap in foil and place in oven at 325 degrees for 7 to 10 minutes.