Add sesame oil to Instant Pot and set the “Sauté” setting to high. Working in batches, if necessary, brown the chicken thighs, approximately 3-4 minutes per side. Repeat this process with remaining thighs. Remove and set aside on a platter.
Pour chicken broth into hot container and gently scrape up brown bits from bottom. Add peanut butter to the hot liquid and stir until completed melted. Add soy sauce, lime juice, honey, Sriracha sauce, ginger, and garlic powder. Season with salt and black pepper, to taste, and stir to combine.
Add metal rack to the Instant Pot and place the browned chicken thighs on top.Add lid and lock into place. Switch vent to “Sealing” position and set the “Manual” setting on high before adjusting the cook time to 10 minutes. After a brief pause, the Instant Pot will automatically start building pressure.
When finished, do a quick release (QR) to allow the pressure to escape. Unlock and carefully remove lid when finished and transfer the chicken to a platter.