How to Make It
Combine first 14 ingredients (through bay leaf) in the inner pot of a 6-quart Instant Pot®. Close and lock the lid of the Instant Pot®. Turn the steam release handle to "Venting" position. Press [Slow Cook], and use [Adjust] to select "Less" mode. Press [-] or [+] to choose 8 hours cook time. Turn cooker off. Skim fat from surface of cooking liquid. Discard bay leaf. Partially mash beans with back of spoon. Ladle soup into 8 bowls.Serve with sour cream, diced onion, and cilantro, if desired.