Start by giving your squash a good rinse.
1 medium butternut squash
Place the trivet into the Instant Pot insert, and then place your whole butternut squash or squash halves on the trivet.
Add 1.5 cups of water to the instant pot.
1.5 cups water
Add the lid, and flip the vent to sealing.
Set the instant pot to Manual / High pressure to 20 minutes for a whole squash, or 8 minutes for squash halves.
When the pressure cooking cycle is complete, allow the pressure to release naturally for 10 minutes, and then flip the vent to "venting" to release the remaining pressure.
Carefully remove the squash from the Instant Pot, and allow it to cool.
Split the squash in half, scoop the seeds out, and either peel the skin away or scoop the flesh out with a spoon.
Use cooked squash as desired.