Preheat your oven to 375°F. Line a baking sheet with parchment paper.

On a lightly floured surface, roll out the pizza dough into a rectangle about 1/4 inch thick. Cut the dough into 2-inch squares.

In a mixing bowl, combine the mozzarella cheese, pepperoni, Parmesan cheese, Italian seasoning, garlic powder, and crushed red pepper flakes. Mix well.

Place a tablespoon of the cheese and pepperoni mixture in the center of each dough square. Fold the corners of the dough over the filling and pinch to seal tightly, forming a ball.

Arrange the pizza bombs on the prepared baking sheet. Brush the tops with the beaten egg for a golden finish.

Bake in the preheated oven for 15-20 minutes, or until the pizza bombs are golden brown and cooked through.

Remove from the oven and let cool for a few minutes before serving. Serve warm with marinara sauce for dipping.