Heat oven to 425°. Line a rimmed cookie sheet with parchment paper or tin foil. Or just lightly spray the cookie sheet with cooking spray.
Lay both bread halves on cookie sheet.
In a small bowl, combine the jar of pizza sauce, parmesan cheese, garlic salt, and Italian seasoning. Mix together and evenly spread it over both halves of bread.
Top with the shredded mozzarella and then finish with the pepperoni and/or other toppings you prefer.
Bake for 20-25 minutes. Let cool for 5 minutes before cutting into slices.
