On sauté in a pressure cooker. When the pot is prepared, add the salt, onions, and garlic. Sauté until the onions are transparent and the garlic starts to become golden (about 3-5 minutes).
It's optional to heat the broth and water to speed up cooking while the onions and garlic are sautéing.
Pour in the broth and water, then whisk the hot liquid to wipe the Instant Pot's bottom clean.
The pot should now contain the navy beans, carrots, and celery. Press the Cancel button, shut the pressure cooker's lid, and then lock the pressure lever (if needed). For dry, unsoaked navy beans, set the Instant Pot on high pressure for 45 minutes.
After 10 minutes of letting the pressure in the pressure cooker naturally relax (without touching the pot), start the rapid release.
Use a potato masher to thoroughly mash the beans for a creamier soup.
Bean soup should be served hot and garnished with cheese, bacon bits, fried onions, green onions, or your preferred soup toppings.