Italian Beef Patties

1 lb ground round 1 cup freshly grated parmesan cheese 2 egg yolks salt & fresh ground pepper 2 tablespoons butter 1/4 onion , thinly sliced 1 tablespoon[...]

1 1/2 lbs ground beef 1/2 teaspoon salt 1 dash pepper 1/4 cup flour 2 eggs , beaten 1 cup dry breadcrumbs 3 tablespoons vegetable oil 6 slices mozzarella[...]

2/3 cup pizza sauce, divided 1 egg , beaten 1/3 cup dry breadcrumbs 2 teaspoons dried onion flakes 1/2 teaspoon dried oregano 1/4 teaspoon salt 1/8 teaspoon[...]