01 - Turn on your oven broiler to prepare for toasting the rolls and melting the cheese.
02 - Place the split hoagie rolls cut-side up on a baking sheet. Layer each roll half with provolone and mozzarella cheese slices evenly.
03 - Slide the baking sheet under the broiler for 1 to 2 minutes, watching closely, until the cheese melts completely and the bread edges turn golden brown.
04 - Remove from the oven. Arrange Genoa salami, deli ham, mortadella or turkey, and capicola slices evenly across the bottom halves of each roll.
05 - In a large mixing bowl, combine the shredded lettuce, sliced red onion, pepperoncini, halved cherry tomatoes, and black olives.
06 - In a small bowl, whisk together mayonnaise, red wine vinegar, olive oil, dried oregano, garlic powder, salt, and black pepper until emulsified and smooth.
07 - Pour the dressing over the vegetable mixture and toss thoroughly until every ingredient is evenly coated.
08 - Mound a generous portion of the dressed salad directly on top of the layered cold cuts on each roll bottom.
09 - Sprinkle freshly cracked black pepper over the salad along with grated Parmesan if desired. Place the toasted tops on the sandwiches, press down gently, and serve immediately while the cheese is still warm.