Seat glass pitcher on the base of the Instant Pot® Ace and add butternut squash, chicken stock, yellow onion, brown sugar, thyme, and nutmeg.
Secure and lock lid.
Choose the Soup •• program for creamy soup (22:44 minutes).
Once program has completed, carefully remove lid and stir in fresh sage and butter.
Season with salt and pepper to taste before serving. Top with a dollop of sour cream, drizzle of heavy cream, and/or sprinkling of pumpkin seeds, if desired.