Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
On a lightly floured surface, roll out the pizza dough into a rectangle, approximately 12x16 inches.
Spread marinara sauce evenly over the dough, leaving a small border around the edges.
Layer the pepperoni, salami, and ham evenly over the sauce.
Sprinkle the shredded mozzarella and provolone cheeses over the meats.
Add grated Parmesan cheese, oregano, garlic powder, salt, and pepper over the top.
Starting from one long end, carefully roll the dough up into a tight log, pinching the seams to seal.
Place the rolled Stromboli seam-side down on the prepared baking sheet.
Beat the egg in a small bowl and brush it over the top of the dough for a golden finish.
Bake in the preheated oven for 25 minutes, or until golden brown and cooked through.
Let the Stromboli cool for a few minutes, then slice into pieces and serve warm.