1Cut chicken thighs into bite-sized cubes. Place in a bowl and toss with 1/2 cup cornstarch until evenly coated.
2Arrange chicken cubes in the air fryer basket and spray generously with olive oil spray.
3Cook at 200°C (390°F) for 10-15 minutes. Halfway through, shake the basket and spray with a little more oil. Internal temperature should reach at least 74°C (165°F).
4While chicken cooks, prepare the sauce: in a small saucepan, combine soy sauce, brown sugar, orange juice, hoisin sauce, ground ginger, and crushed garlic.
5Heat over medium-high heat, stirring until sugar dissolves and mixture comes to a gentle boil.
6In a small bowl, mix cold water with 1 tablespoon cornstarch. Pour this slurry into the saucepan and stir until sauce thickens.
7Add sesame seeds, stir, then set aside. Let the sauce rest for 5 minutes to thicken further.
8When chicken is done, remove from air fryer and transfer to a bowl. Pour sauce over and toss to coat evenly.
9Serve over cooked rice and, if desired, garnish with sliced green onion.