Preheat the air fryer: Set to 400°F (200°C) for 5 minutes. A hot basket helps crisp the skin right away.
Pat the chicken dry: Use paper towels to remove surface moisture.
Dry skin equals crisp skin.
Mix the spice rub: In a small bowl, combine 2 teaspoons paprika, 1 teaspoon garlic powder, 1 teaspoon onion powder, 1 teaspoon dried oregano or thyme, 1 teaspoon kosher salt, and 1/2 teaspoon black pepper. Add a pinch of cayenne if you like heat.
Oil and season: Drizzle 1–2 teaspoons olive oil over the thighs. Rub the spice mix all over, getting under the skin where you can for extra flavor.
Arrange in the basket: Place thighs skin-side down in a single layer, not touching.
Work in batches if needed.
Air fry, then flip: Cook at 400°F (200°C) for 10–12 minutes. Flip so the skin faces up and cook another 8–12 minutes, until the skin is crisp and the internal temperature hits 165°F (74°C) in the thickest part.
Rest and serve: Let the chicken rest 5 minutes. Finish with a squeeze of lemon if you like, and serve hot.