Creating Italian Sub Pizza is a breeze with these simple steps:

1. Preheat Oven: Preheat your oven to 425°F (220°C).
2. Prepare Pizza Crust: Roll out your pizza crust on a lightly floured surface to your desired thickness. Transfer it to a pizza stone or baking sheet.
3. Spread Sauce: Evenly spread the marinara sauce over the pizza crust, leaving a small border around the edges.
4. Add Cheese: Sprinkle the shredded mozzarella cheese generously over the sauce.
5. Layer Meats: Arrange the pepperoni, salami, and ham slices evenly over the cheese.
6. Add Vegetables: Scatter the diced green bell pepper, red onion, and black olives on top of the meats.
7. Season: Sprinkle the Italian seasoning and crushed red pepper flakes (if using) over the entire pizza.
8. Bake: Place the pizza in the preheated oven and bake for 20-25 minutes, or until the crust is golden brown and the cheese is bubbling.
9. Cool: Remove the pizza from the oven and let it cool for about 5 minutes.
10. Garnish: Add fresh basil leaves on top for an aromatic finish.

Following these steps will ensure that your Italian Sub Pizza turns out perfectly every time.