Combine minced lemongrass, garlic, ginger, soy sauce, fish sauce, honey, oil, black pepper, and sesame oil in a bowl. Whisk until fully combined. The mixture should be fragrant and slightly sticky, ready to coat the chicken evenly.
Add chicken thighs to the marinade and mix thoroughly. Cover and let it marinate for at least 30 minutes, preferably up to 2 hours, to allow the flavors to penetrate. The longer it marinates, the more tender and flavorful the chicken becomes.
Preheat the air fryer to 380°F (193°C) for 3–5 minutes. Place the chicken in a single layer in the basket, ensuring they aren’t overcrowded. This allows for even cooking and maximum caramelization.
Cook chicken for 15–20 minutes, flipping halfway through for even browning. The exterior should be golden and slightly crisp, while the interior remains juicy. Adjust time slightly depending on your air fryer model.
Transfer chicken to a serving platter. Garnish with sliced green onions, cilantro, or sesame seeds for a fresh, colorful finish. Serve with rice, noodles, or a side of vegetables for a complete meal.