Preheat your oven to 375°F (190°C).

Carefully slice the Italian sub rolls in half lengthwise, keeping them hinged to create a pocket.

In a small microwave-safe bowl, melt the unsalted butter in the microwave for about 20-30 seconds.

Mix garlic powder, onion powder, dried oregano, dried basil, red pepper flakes, salt, and black pepper into the melted butter.

Brush the seasoned butter mixture over the cut sides of the Italian sub rolls.

Layer the deli-sliced salami, sweet deli-sliced ham, and pepperoni on the bottom halves.

Sprinkle the deli-sliced mozzarella and provolone cheese over the pepperoni.

Sprinkle the grated Parmesan cheese over the mozzarella and provolone, then layer with roasted red peppers, black olives, and banana peppers.

Add fresh basil leaves on top.

Bake the sandwiches for 10-12 minutes, until the cheese is melted and bubbly.

Allow the sandwiches to cool for about a minute before cutting and serving.

Serve your warm sandwiches with a side of salad, fries, or pickles.