Pat chicken cubes dry with paper towels.
Season with salt and pepper.
Set up three shallow bowls for breading.
First bowl: add cornstarch.
Second bowl: add beaten eggs.
Third bowl: add panko bread crumbs.
Coat each chicken cube in cornstarch. Shake off excess.
Dip in beaten egg. Let excess drip off.
Press into panko. Coat all sides well.
Place on plate. Repeat with all chicken.
Preheat air fryer to 400°F for 3 minutes.
Spray air fryer basket with cooking spray.
Arrange chicken in single layer. Do not overcrowd. Work in batches if needed.
Spray tops lightly with cooking spray.
Air fry at 400°F for 12 to 15 minutes. Shake basket or flip at 6 to 7 minutes.
Check internal temperature reaches 165°F and coating is golden brown.
Make sauce. Whisk mayonnaise, sweet chili sauce, sriracha, honey, rice vinegar, and garlic powder.
Taste sauce. Adjust sriracha for heat level.
Transfer hot chicken to bowl with sauce.
Toss gently to coat all pieces.
Transfer to platter. Garnish with green onions, sesame seeds, and cilantro.
Serve immediately while hot and crispy.