In a mixing bowl, combine the olive oil, red wine vinegar, dried oregano, garlic powder, salt, and black pepper.

Whisk the ingredients together until well combined. This dressing will add flavor and moisture to the sandwich.

Take the Italian bread slices and lay them out on a clean cutting board.

On half of the slices, layer the chopped salami, capicola, provolone cheese, shredded romaine lettuce, halved cherry tomatoes, and sliced pepperoncini.

Drizzle the prepared dressing generously over the layered ingredients.

Top with the remaining slices of bread to create sandwiches.

If desired, use a sandwich press or grill to toast the sandwiches until golden brown and the cheese is melted.

Cut each sandwich in half and serve immediately, or wrap in parchment paper for a picnic.