Preheat your air fryer to 380°F. In a large mixing bowl, whisk together the sweet chili sauce, soy sauce, honey, rice vinegar, minced garlic, grated ginger, and red pepper flakes until smooth and well combined.

Add the chicken pieces to the sauce mixture and toss thoroughly to coat. Let it marinate for 10-15 minutes at room temperature.

In a separate bowl, toss the halved Brussels sprouts with olive oil, salt, and pepper until coated. Place them in the air fryer basket in a single layer and cook for 8-10 minutes, shaking the basket at the 5-minute mark.

Remove the Brussels sprouts and set aside. Place the marinated chicken in the air fryer basket in a single layer. Cook for 10-12 minutes, flipping at the halfway point.

Return the Brussels sprouts to the basket with the cooked chicken and air fry for another 2-3 minutes. Transfer to a serving dish and sprinkle with sesame seeds and sliced green onions.