Prepare the Sauce: In a medium bowl, whisk together the soy sauce, honey, minced garlic, grated ginger, rice vinegar, sesame oil, and chicken broth. Set aside.
Sear Chicken (Optional): Press the 'Sauté' button on your Instant Pot and add olive oil. Once hot, sear the chicken thighs for 2-3 minutes per side until lightly browned. This step is optional but adds depth of flavor. Remove chicken and set aside.
Deglaze and Add Sauce: Pour a splash of chicken broth into the Instant Pot and scrape up any browned bits from the bottom to prevent a 'Burn' error. Pour in the prepared honey garlic sauce. Return the chicken thighs to the pot.
Pressure Cook: Secure the lid, ensure the venting knob is in the 'Sealing' position. Set the Instant Pot to 'Manual' or 'Pressure Cook' on HIGH for 8 minutes. For bone-in thighs, cook for 10 minutes.
Natural Pressure Release: Once cooking is complete, allow a natural pressure release (NPR) for 5 minutes, then quick release the remaining pressure by carefully turning the venting knob to 'Venting'.
Thicken the Sauce: Remove the chicken thighs from the pot and set aside. Press the 'Sauté' button. In a small bowl, whisk together cornstarch and cold water to create a slurry. Slowly pour the slurry into the simmering sauce in the Instant Pot, whisking constantly until the sauce thickens to your desired consistency.
Serve: Return the chicken to the thickened sauce, tossing to coat. Garnish with sliced green onions and sesame seeds. Serve hot with your favorite sides.