Heat your pressure cooker on medium heat with a splash of cooking oil, no lid for this. When hot, brown the chicken pieces for a few minutes on each side, season as you desire with salt, pepper, and paprika and brown the pieces, you are browning not trying to cook the chicken through, that comes later, work in batches as needed. Return all the browned chicken to the pressure cooker and remove the cooker from the heat.
In a bowl, mix together the BBQ sauce, water, onion, and vinegar. Pour sauce over the chicken. (I used the variant and went with Sriracha sauce.)
Place the cooker back on the heat and secure the lid to the cooker. Turn heat to high to lock up the cooker and get the jiggler moving and releasing pressure. Start timing for 8 minutes and reduce the heat to maintain the jiggler movement and pressure release.
At 8 minutes, turn off the heat and move the cooker to an unused burner to do a natural release of pressure, about 10-15 minutes.
Open pressure cooker carefully, plate with a side or two, serve. (Now out of fear of loosing a hand or arm during the feeding frenzy, no photos this time of a plated dish. This photo also shows 3 thighs have been removed.)
This photo was leftovers on the day after and just nuke to reheat :)