- Preheat oven to 450°F.
- Mix together cheese, bread crumbs, oregano, salt, pepper and olive oil.
- Spoon mixture onto tomato halves.
- Bake for 15 minutes.
- Cut bread into 4 segments and then slice in half lengthwise.
- Mix together mayonnaise and mustard and spread onto bread.
- Add mozzarella slices and lettuce to sandwich bottoms and top with tomatoes and black olives. Place the top bread slice on the tomatoes and press down lightly.
- Serve with lots of napkins!