Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper.
If your French bread is not pre-sliced, cut it crosswise into 1-inch thick slices, but do not cut all the way through the bottom crust. This will create pockets for the filling.
1 loaf French bread
Spread pizza sauce evenly into each slice of the French bread.
1 loaf French bread
Stuff each slice with shredded mozzarella cheese and pepperoni slices.
1 loaf French bread
Sprinkle the top with grated Parmesan cheese, Italian seasoning, and garlic powder.
1 loaf French bread
Wrap the bread loosely in aluminum foil and bake for 15 minutes.
Remove the foil and bake for another 5-7 minutes, or until the cheese is melted and bubbly and the bread is golden brown.
Let cool slightly before serving. Pull apart the slices and enjoy!
Notes
You can customize the toppings with your favorite pizza ingredients like mushrooms, olives, or bell peppers.