Preheat the oven to 375°F (190°C) and line a baking sheet with parchment paper.

In a skillet over medium heat, cook the ground meat with onion and bell pepper until browned. Drain excess grease and season with garlic powder, Italian seasoning, and pepper.

Roll the pizza dough into a large rectangle on a lightly floured surface.

Spread the cooked meat mixture evenly over the dough, leaving a small border around the edges.

Sprinkle mozzarella, Parmesan, and chopped pepperoni on top.

Carefully roll the dough lengthwise into a tight log, sealing the edges. Place seam-side down on the baking sheet.

Brush the top with beaten egg for a golden finish.

Bake for 22–25 minutes, or until golden brown and fully cooked through.

Let rest for 5 minutes before slicing. Serve warm with marinara sauce if desired.