Pour chicken broth or water into your Instant Pot with your finely diced onions. Place your trivet on top of that. Unwrap your frozen chicken with breasts facing up on top of your trivet. Sprinkle some water or olive oil on top and sprinkle seasonings so they stick on top.
Close your lid and steam valve and set to high pressure for 60 minutes. Allow to naturally release steam for 15 minutes. Carefully remove chicken (it will want to fall apart).
Shred meat now if you wish and serve, or if you want to crisp skin move into an 8×8 dish. Sprinkle a bit more seasonings on top of your whole chicken. Turn your broiler on and put your chicken in oven for 3-4 minutes or until skin crisps up as much as you’d like.