Preheat oven to 400°F (200°C).
Unroll the pizza dough onto a lightly floured surface.
Spread the marinara sauce evenly over the dough, leaving a small border around the edges.
Sprinkle the shredded mozzarella cheese, chopped pepperoni, grated Parmesan cheese, dried oregano, garlic powder, and crushed red pepper flakes (if desired) over the sauce.
Starting from one edge, roll the dough tightly into a log.
Using a sharp knife, slice the log into 1-inch (2.5 cm) thick slices.
Place the slices on a baking sheet lined with parchment paper.
Bake in the preheated oven for 15-18 minutes, or until the pizza snacks are golden brown and the cheese is melted and bubbly.
Remove from the oven and let cool for a few minutes before serving.
Enjoy!