Crafting a delicious tremendous cheesy pepperoni Stromboli is straightforward. Follow these steps for guaranteed success:

1. Preheat the Oven: Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.

2. Prepare the Dough: On a lightly floured surface, roll out the pizza dough into a large rectangle, about 12×16 inches.

3. Add the Filling: Sprinkle mozzarella cheese evenly over the dough, leaving a slight border around the edges. Layer the pepperoni on top of the cheese, followed by a sprinkle of Parmesan cheese and Italian seasoning.

4. Season the Dough: Mix the garlic powder, salt, and black pepper in a small bowl. Sprinkle this seasoning mixture over the filling to enhance the flavors.

5. Roll It Up: Carefully roll the dough from one long side to the other, sealing the edges as you go to create a log shape. Pinch the seams to ensure the filling stays inside.

6. Prepare for Baking: Place the rolled Stromboli seam-side down on the prepared baking sheet. Brush the top with the beaten egg to create a golden crust when baked.

7. Make Slits: Use a sharp knife to make a few shallow slits on top of the Stromboli. This will allow steam to escape during baking.

8. Bake: Place the Stromboli in the preheated oven and bake for 20-25 minutes, or until golden brown on top.

9. Cool: Once baked, remove from the oven and let it cool on the baking sheet for 15-20 minutes.

10. Slice and Serve: Using a sharp knife, slice the Stromboli into generous pieces for serving.