Secure the lid and set the Instant Pot to high pressure for 12 minutes.
Release the pressure quickly and remove the lid carefully.
Whisk flour with some half-and-half in a small bowl. Add this mixture with the remaining half-and-half to the soup. Simmer for 5-10 minutes. Add bacon before serving.
Notes
Serve warm with shredded cheddar and sliced chives on top for extra flavor. Store leftovers in the fridge or freeze for longer preservation.