Preheat your oven to 400°F (200°C).
Roll out the pizza dough on a floured surface into a rectangle.
Spread marinara sauce evenly over the dough, leaving a border.
Layer the pepperoni and salami over the sauce.
Sprinkle mozzarella and Parmesan cheese on top of the meats.
Sprinkle Italian seasoning evenly across the filling.
Carefully roll the dough tightly from one long side to the other.
Pinch the ends to seal the stromboli.
Place the stromboli seam-side down on a baking sheet.
Brush the top with beaten egg for a golden finish.
Bake for 25-30 minutes until golden brown.