Add the insert back into the Instant Pot and set the Instant Pot to “sauté” on high.
Once the pot is hot, add the salted butter to the insert.
Once the butter is melted, add the diced onion and sauté until lightly browned and translucent (about 5-10 minutes).
While the onion is cooking, use a paring knife to peel the butternut squash. Run your paring knife just slightly under the skin, working in strips to remove the skin. The cooking time in the Instant Pot loosens the skin significantly, making it so much easier to peel. The squash will be hot, so be careful. Once the squash is peeled, dice it into 1” chunks.
Once the onions are lightly browned, add the chicken broth, and deglaze the pot using a wooden spoon, breaking up any browned bits on the bottom of the pot.
Add the cubed butternut squash into the Instant Pot, and then add in the cinnamon, nutmeg, salt, and pepper. Stir well to combine.
Replace the lid on the Instant Pot and set the valve to “sealing.” Set the pot to 6 minutes on high pressure.
Once the cooking time is up, flip the valve to “venting” and let the steam release completely. Once the pin has dropped, indicating the pressure has been released, open the lid carefully.
Use a hand blender to blend the contents of the Instant Pot until smooth.
Add the maple syrup and the can of coconut milk to the pot and use the hand blender to mix it thoroughly into the soup.
Garnish with Maple Candied Walnuts if desired, serve, and enjoy!