In a large bowl, combine the egg, pizza sauce, bread crumbs and Italian seasoning. Crumble beef over mixture and mix well. Divide among 12 greased muffin cups; press onto the bottom and up the sides. Fill each center with cheese.
Bake at 375 for 15-18 minutes or until meat is no longer pink. Serve immediately with additional pizza sauce if desired.
**Or let the cups cool and place in freezer bags and freeze for up to 3 months. To use the frozen cups, thaw in the refrigerator for 24 hours. Heat on a microwave safe plate on high for 2-3 minutes or until heated through.