Creating Baked Italian Sub Sandwiches is a simple process that can be broken down into easy steps:

1. Preheat the Oven: Set your oven to 375°F (190°C) to prepare for baking.
2. Prepare the Rolls: Slice each Italian sub roll in half lengthwise, creating a top and bottom.
3. Layer the Meats: Place a layer of salami on the bottom half of each sub roll.
4. Add the Ham: Follow with a layer of sliced ham over the salami.
5. Include Pepperoni: Add a layer of pepperoni on top of the ham.
6. Add Cheese: Place slices of provolone cheese over the meats, and sprinkle shredded mozzarella on top.
7. Add Vegetables: If using, layer banana peppers, black olives, diced tomatoes, and shredded lettuce on top of the cheese.
8. Season the Sandwiches: Drizzle olive oil over the fillings and sprinkle Italian seasoning, salt, and pepper to taste.
9. Cover with the Top: Place the top half of the sub roll on each sandwich.
10. Wrap in Foil: Wrap each sandwich in aluminum foil to keep them warm and toasting evenly.
11. Bake: Place the wrapped sandwiches in the preheated oven and bake for 15-20 minutes, or until the cheese has melted and the rolls are crispy.
12. Serve: Remove from the oven, unwrap, and slice in half if desired. Serve hot.

These simple steps will guide you in creating these incredible sandwiches effortlessly.