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

Roll out your pizza dough on a lightly floured surface until about ¼ inch thick and cut into 4x4 inch squares.

Place a small spoonful of marinara sauce in the center of each dough piece, leaving edges clear.

Sprinkle mozzarella cheese over each sauce spoonful and add any optional fillings.

Fold the dough over to create pockets, pinch edges to seal, and crimp with a fork.

Whisk the egg and lightly brush the tops of the pockets with egg wash, adding oregano or garlic powder if desired.

Bake pockets on the prepared baking sheet for 12-15 minutes until golden brown.

Let the pockets cool on a wire rack for a few minutes before serving.