Preheat air fryer to 400°F (200°C).
Wash radishes and pat them completely dry with a paper towel.
In a mixing bowl, combine radishes, olive oil, garlic powder, onion powder, salt, and pepper; toss to coat thoroughly.
Arrange radishes in the air fryer basket in a single layer.
Cook for 15 minutes, shaking the basket every 5 minutes to ensure even browning.
Transfer to a serving dish and garnish with dried parsley.