2 lbs. ground beef
1 med. onion
1 jar pizza sauce
1 lg. pkg. Mozzarella cheese
1/2 lb. Velveeta cheese

Cook ground beef and drain. Add onion, Velveeta and pizza sauce. Cook until cheese melts. Spoon on split buns and top with Mozzarella cheese. Place in 350 degree oven until cheese melts.