Preheat your oven to 375°F (190°C).

Carefully slice the Italian sub rolls in half lengthwise.

In a small bowl, combine melted butter with garlic powder, onion powder, dried oregano, dried basil, red pepper flakes, salt, and black pepper.

Brush the seasoned butter mixture over the cut surfaces of each roll.

Layer the salami, ham, and pepperoni on the bottom half of each roll, followed by mozzarella cheese.

Add provolone cheese and sprinkle grated Parmesan over the top, then add roasted red peppers, olives, and banana peppers.

Add fresh basil leaves on top of the assembled sandwiches.

Carefully place the baking sheet in the preheated oven and bake for 10-12 minutes.

Once baked, remove the sandwiches from the oven and let them cool slightly.