mozzarella cheese, shredded
grated parmesan cheese
2Brown ground beef in skillet.
5In a small mixing bowl, combine tomato sauce, oregano, pepper and garlic salt.
6Arrange muffin halves on a baking sheet.
7Spread tomato mixture over each muffin half.
8Top tomato mixture with browned ground beef.
9Top beef with mozzarella and parmesan cheeses.
10Bake for 10 to 15 minutes or until cheese melts.