Preheat the air fryer to 400°F / 200°C for 3 minutes.
Pat the chicken thighs dry, then rub with olive oil, garlic powder, smoked paprika, onion powder, black pepper, and salt until evenly coated.
Arrange the chicken thighs in a single layer in the air fryer basket without overlapping.
Air fry at 400°F / 200°C for 16 to 18 minutes, flipping halfway, until golden brown and the internal temperature reaches 165°F / 74°C at the thickest part.
Check at 16 minutes — the exterior should be golden and slightly crisp, and if needed, add 2 more minutes.
Rest for 3 minutes before serving to let the juices redistribute and keep the chicken moist.