Preheat the oven to 400°F (200°C).
Line a baking sheet with parchment paper.
Divide the pizza dough into 8 equal pieces.
Roll each piece into a rectangle about 5 x 7 inches.
Spread about 1 tablespoon of pizza sauce onto one half of each rectangle, leaving a border around the edges.
Top with mozzarella cheese, a sprinkle of Parmesan, pepperoni if using, Italian seasoning, garlic powder, and oregano.
Fold the dough over the filling to create a pocket.
Press the edges together firmly, then crimp with a fork to seal.
Place the pizza pockets onto the prepared baking sheet.
Mix the melted butter with the garlic powder and Italian seasoning.
Brush the tops of the pizza pockets with the butter mixture.
Bake for 18 to 22 minutes, or until golden brown and the cheese is melted.
Allow the pizza pockets to cool for 5 minutes before serving with warm marinara sauce.