Place chicken in the bottom of the Instant Pot and season with salt and pepper.
In a small mixing bowl, whisk together honey, ketchup, brown sugar, soy sauce, vegetable oil, garlic and onion.
Pour sauce over chicken in the Instant Pot.
Place lid on the Instant Pot, close and set to sealing.
Press the MANUAL button (or PRESSURE COOK) and set timer for 15 minutes.
Do a QUICK RELEASE of the pressure and when the pin drops, remove the lid.
Remove chicken from the Instant Pot and cut into bite-sized pieces; set aside.
Whisk together water and corn starch in a small bowl and whisk into the sauce in the Instant Pot. Press the Saute button and cook for 5 minutes, stirring constantly.
When the sauce has thickened, fold in cooked chicken and turn off the Instant Pot.
Serve over rice and garnish with sesame seeds and green onion.