Preheat the oven to 375°F (190°C).

Slice the Italian sub rolls in half lengthwise and arrange cut side up on a baking sheet lined with parchment paper.

Melt the unsalted butter and mix in garlic powder, onion powder, dried oregano, dried basil, red pepper flakes, salt, and black pepper.

Brush the cut sides of the rolls with the seasoned butter mixture.

Layer the deli-sliced salami, ham, and pepperoni on the bottom half of each sandwich.

Add mozzarella and provolone cheese on top of the meats.

Sprinkle grated Parmesan, and add roasted red peppers, sliced black olives, banana peppers, and fresh basil leaves.

Bake in the preheated oven for 10-12 minutes until cheese is melted and bread is golden brown.

Allow to cool for a minute, then slice into portions for serving.

Serve warm and enjoy.