You have to cut the chicken pieces into bite size pieces.
Then you have to place all the chicken pieces into a ziploc bag carefully.
Add ginger, garlic, salt, pepper, soy sauce, and mirin in this ziploc bag where you have placed the chicken previously.
Now you have to air-tight the bag and marinate the chicken for at least one hour and maximum overnight. It would be better for you to marinate the chicken overnight to get the best taste.
Now take out the chicken and remove the excess marinade from the back carefully.
Now take another bowl and put potato starch in it.
Toss the chicken pieces in potato starch in this bowl and make sure to coat the chicken pieces nicely.
Continue that you have to make sure of is to coat the chicken pieces properly so they can get the crispiness as desired.
Now carefully place the chicken in the air fryer wire rack.
You have to place the chicken and apply an olive oil spray either with the use of a spray bottle or with the use of an oil brush.
Keep in mind to coat the olive oil in such a way that there is no dry potato starch left behind.
Now you have set the air fryer to 390° Fahrenheit for 5 minutes for each side of the chicken.
In total, it will take 10 minutes at this temperature to prepare chicken karaage.