01 -
Heat the oven to 400°F (200°C). Line a rimmed baking sheet with parchment paper.
02 -
Lightly flour the work surface and roll the room-temperature pizza dough into a 10x14-inch rectangle. Keep the dough as even as possible.
03 -
Sprinkle mozzarella over the dough, leaving a 1-inch border. Layer the pepperoni over the cheese, then sprinkle with Parmesan, Italian seasoning, and garlic powder.
04 -
Starting from a long side, roll the dough into a tight log. Pinch the seam closed and tuck the ends under. Place seam-side down on the prepared baking sheet.
05 -
Beat the egg with 1 teaspoon water. Brush the top and sides with the egg wash, then cut 4-5 shallow diagonal slits across the top.
06 -
Bake for 22-26 minutes, until the crust is deeply golden and firm. If cheese bubbles through a vent, that is fine.
07 -
Let the stromboli rest for 8-10 minutes before slicing. Serve warm with marinara sauce for dipping.