Preheat air fryer to 380 degrees. Coat inside basket with olive oil spray.
In a small shallow bowl, add the egg and beat well. In another shallow bowl, combine cornstarch and flour.
Dip chicken pieces into egg, then cornstarch/flour. Add pieces to air fryer basket. Place against each other. It’s ok to overlap chicken pieces a bit. Spray top of chicken with olive oil spray. Cook for about 10 minutes until chicken is no longer pink inside. No need to turn chicken over while cooking.
In the meantime, in a small saucepan, mix together all sauce ingredients. Simmer for about 7-10 minutes until heated and flavors combined.
Remove chicken to a bowl and pour the heated sauce over chicken. Mix with a rubber spatula to coat chicken well. Add to a serving plate. Sprinkle sesame seeds all over top.
Serve over cauliflower rice, brown rice, or steamed shredded cabbage. Leftovers freeze great.
Makes 4 servings. Each serving, ½ cup rice and 1 cup orange chicken