To cook acorn squash in the instant pot, start by cutting it in half, and scoop out the seeds with a spoon. Then, cover each acorn squash half in half of the sugar, maple syrup, butter, and cinnamon.
Add 1 cup of water into your Instant Pot (or another electric pressure cooker), and place trivet inside. Place the squash halves on top of the trivet. Lock the lid, closer pressure valve.
Choose high pressure, using the Instant Pot instructions, and set timer for 5 minutes. Allow 10 to 15 minutes for the pressure to increase.
Release pressure with the natural-release method, around 7 minutes. Release any remaining pressure, using the manufacturer's instructions. Unlock the lid, remove the squash, and enjoy!