Preheat the oven to 450 degrees F. Use a long, serrated knife to slice the loaf of Italian bread in half the long way. Place the halves on an ungreased sheet pan. Use your hands to press down the white part of the bread to flatten it as much as you can. Brush the olive oil on the two halves, covering the crust edges first to help them be crispy when baked.
Bake uncovered for 5 minutes.
Add five slices of provolone to each half of the loaf, overlapping as needed. Cover the bread as much as possible. Top each half with ½ cup (one standard ladle) of marinara sauce. Sprinkle on the mozzarella evenly on each half. Top each half with one tablespoon of Parmesan.
Bake, uncovered, for 12-15 minutes. Then, broil the pizza bread for two minutes, watching it carefully so it doesn't burn.
Top the finished pizza with torn basil leaves (or ribbons of basil). Transfer the pizza to a cutting board and let it cool for five minutes before slicing it into planks to serve.
Store leftovers in a sealed container in the refrigerator for up to four days. Or, you can freeze any leftover slices in a zip-top freezer bag. See the notes for reheating suggestions.
Notes
This has the best, crispiest texture the first day you make it. Consider baking just half a loaf if that's all you can consume in one day. Reheating options:
For a small amount, use a pan on the stove over medium heat. Place the thawed slices in the pan, crust side down. Cover and set a timer for 7-8 minutes for thick pieces.
For a larger amount, reheat it in a 350-degree oven on a sheet pan or pizza stone for 10-15 minutes.