Remove insert from the Instant Pot. Place oats, water, brown sugar, pumpkin puree, pumpkin pie spice and a pinch of salt into the insert. Give it a gentle swirl to combine. Place the insert into the instant pot. Put the lid on and set to Sealing.
Steel Cut Oats - Manual, High, Adjust to 7 minutes.
Quick Cook Steel Cut Oats - Manual, High, Adjust to 4 minutes.
Rolled Oats - Manual, High, Adjust to 4 minutes.
Quick release, and then open up the Instant Pot and remove insert immediately.
The oatmeal and any remaining liquid will thicken as it cools. Ladle the oatmeal into bowls and top with nuts or pecans, and swirl in any milk or more sweetener to taste.