Pat very dry: Use paper towels to dry the thighs thoroughly, especially the skin. Dry skin equals crisp skin.
Mix the seasoning: In a small bowl, combine salt, pepper, garlic powder, onion powder, paprika, and thyme.
Oil and season: Rub the thighs with olive oil, then coat evenly with the seasoning mix.
Lift the skin slightly and season underneath for extra flavor.
Preheat the air fryer: Set to 400°F (200°C) for 3–5 minutes. A preheated basket helps the skin crisp right away.
Arrange skin-side down: Place thighs in a single layer, not touching. Cook for 10 minutes.
Flip skin-side up: Cook another 12–16 minutes, depending on size.
The skin should be deep golden and crisp.
Check doneness: Use an instant-read thermometer. Aim for 175–185°F in the thickest part. Thighs are best above 175°F for tenderness.
Rest and serve: Let the chicken rest 5 minutes.
Squeeze lemon over the top if you like. Serve with a simple salad, roasted veggies, or rice.