Follow these simple steps to create your delicious Halloween Stromboli:

1. Preheat Oven: Begin by preheating your oven to 375°F (190°C).
2. Prepare Dough: Roll out the pizza dough on a floured surface into a rectangular shape, about ¼ inch thick.
3. Add Cheese: Sprinkle the shredded mozzarella cheese evenly over the dough.
4. Layer Meats: Arrange the pepperoni or your preferred meat over the cheese, ensuring even coverage.
5. Add Veggies: Distribute the sautéed bell peppers and sliced olives over the meat.
6. Season: Sprinkle the Italian seasoning and garlic powder evenly on top of the fillings for added flavor.
7. Roll Up: Starting from one end, carefully roll the dough tightly into a log shape, sealing the edges as you go.
8. Prepare for Baking: Place the rolled Stromboli seam-side down on a baking sheet lined with parchment paper.
9. Egg Wash: In a small bowl, beat the egg and brush it over the top of the Stromboli to give it a golden color when baked.
10. Cut Slits: Using a sharp knife, make several diagonal slits on top of the Stromboli for ventilation.
11. Bake: Put the Stromboli in the preheated oven and bake for 25-30 minutes or until golden brown.
12. Cool Down: Once baked, let it cool for a few minutes before slicing it into portions.

These steps will help you create an amazing Halloween Stromboli that’s sure to impress.