Combine all of the ingredients, except green onion, in the Instant Pot and stir to combine.
Close and lock the lid. Select the POULTRY setting and set the cooking time for 15 minutes.
Once timer goes off, allow to Natural Release1 for 10 minutes, then quick release any remaining pressure manually. Carefully open the lid.
Transfer the chicken to a serving bowl.
In a cup, combine the arrowroot starch and water. Mix well.
Add the mixture to the instant pot, press the SAUTE button and continue to cook, stir occasionally until the sauce begins to thicken.
Service the chicken with green onion and sauce. 1Natural Release - after the cooking time is over and your Instant Pot switches to Keep Warm, the pressure will begin to drop without doing anything.