Preheat the air fryer to 390°F if recommended. Scrub and optionally peel the potatoes.
Cut into even 3/4-inch cubes. Rinse briefly in cold water, drain and blot thoroughly dry.
Toss with oil, then sprinkle with paprika, garlic powder, salt, onion powder and pepper while tossing.
Arrange in one layer. Cook at 390°F for 8 minutes and shake.
Cook 6 minutes more and shake again.
Continue 3 to 7 minutes, checking at 17 minutes total, until several faces are crisp and a knife enters the center easily.
Transfer immediately, add herbs if using and serve hot.