Combine the soy sauce, ketchup, honey and garlic.
If you want a crispy skin on the chicken thighs, set the IP to saute and add 1-2 Tablespoons olive oil to the bottom of the pot. Allow to get hot before adding the chicken thighs.
Cook until they release easily from the bottom, about 4-5 minutes, then turn off the IP.
Turn over the chicken thighs and pour the honey garlic sauce all over.
Place the lid on the IP, select "manual" and increase time to 15 minutes.
Quick release. Remove lid. Set IP to saute.
In a small bowl, combine the cornstarch and water to form a slurry. Stir briskly into the honey garlic chicken mixture to thicken the sauce.
When sauce reaches desired consistency, turn IP off and serve. Sprinkle with sesame seeds, if desired.