Preheat oven to 200C/400F. Line a baking sheet with parchment paper.
Wash and cut potatoes into large bites. No peeling needed.
Boil potatoes for 7 minutes until fork-tender. Drain well and dry over low heat.
Toss potatoes with oil, parmesan, garlic, oregano, onion powder, salt, and chili flakes.
Arrange potatoes cut-side down on the lined baking sheet, with toppings under or on potatoes.
Roast for 30–35 minutes until golden and crispy on the edges.
Sprinkle with chopped parsley and more salt if needed before serving.