Prepare the Marinade: In a blender, combine the pear, green onion, soy sauce, brown sugar, mirin, sesame oil, avocado oil, garlic, and ginger. Blend until smooth. For a spicier version, add gochujang.
Marinate the Chicken: Place chicken thighs and marinade in an airtight container, refrigerate for at least 1 hour (overnight is best).
Air Fry: Preheat air fryer to 385°F. Place marinated chicken in the basket and cook for 25 minutes, flipping halfway through, until the chicken reaches an internal temperature of 165°F.
