Brown the ground beef and chopped onion in a skillet.

Drain any excess fat from the skillet.

Stir in tomato sauce, catsup, parmesan cheese, garlic powder, and oregano.

Slice Kaiser rolls (or hamburger buns) in half horizontally.

Butter the top and bottom halves of each roll.

Sprinkle garlic powder and paprika on each roll.

Spoon the meat mixture onto the bottom half of each roll.

Top with a slice of mozzarella cheese.

Replace the top half of the roll.

Wrap each sandwich individually in Reynolds Wrap (aluminum foil).

Bake in a preheated oven at 350°F (175°C) for 15 minutes, or until heated through and the cheese is melted.

If frozen, bake for approximately 25 to 30 minutes.