Cut the chicken into cubed chunks, then toss in a bowl with Cornstarch or Potato Starch. Use enough to coat the chicken evenly.
Coat the basket of the air fryer with grapeseed oil spray, then place the chicken evenly into the basket. Cook at 390°F for 10-15 minutes or until the chicken has reached an internal temperature of at least 165°F. Throughout the cooking time, stir up the chicken and coat it with additional grapeseed oil. This will make the chicken crispy and not floury.
While the chicken is cooking, in a small saucepan, combine the soy sauce, water, rice wine vinegar, brown sugar, regular sugar, garlic, and ginger. Whisk this well until it's nicely combined.
Bring this to a low boil, combine the 1/2 tbsp cornstarch and 1/2 tbsp water in a small bowl to make a slurry, then whisk the cornstarch combination into the sauce mixture.
Remove from heat for about 5 minutes to thicken.
Set aside.
Once the chicken is cooked up to an internal temperature of at least 165°F, mix it into the sauce and warm up. This can be done in a small skillet or the saucepan, simply coat the chicken with the sauce.
Serve the chicken over the cooked rice with green beans.
Garnish with green onion.