5. Transfer the potatoes to a large mixing bowl and drizzle with the olive oil. Sprinkle with the paprika, onion and garlic powders + the rosemary leaves. Using a spatula give them a gentle toss to coat all over in the spice mix. Give it a taste and if desired add salt, pepper and chili flakes. (If you seasoned your potatoes well during boiling you might not need any extra salt at all).