Start by making the sauce in a medium-sized saucepan, mix the soy sauce, water, mirin, rice vinegar, brown sugar, ginger, garlic, and cornstarch. Mix well. Bring to a low simmer, and then remove from heat.
Split the sauce into two bowls, one will be the chicken’s marinade, and the other one will be the dipping sauce to serve with the chicken.
Dice your chicken into 1 to 2-inch pieces. Then pour the marinade in and mix well. Refrigerate for about 30 minutes.
Thread the chicken through the skewers, spay the air fryer basket, set the temperature to 370 degrees F, air fryer setting for 5 minutes, then flip the chicken (with tongs), and air fry another 5-8 minutes.
Garnish with salt, black pepper, sesame seeds and green onions before serving. (optional)
Plate, serve and enjoy!