Making Instant Pot Broccoli Cheese Soup, with tender pieces of broccoli in a cheesy, creamy soup, if so quick you won't even believe it when you taste how good it is.
Turn on saute mode on the Instant Pot and let it get hot. Add the butter. When melted, add the onion and celery. Saute for 3-5 minutes. Add the garlic. Saute for 30 seconds.
Turn off saute mode.
Add the broccoli, chicken broth, salt, and pepper to the pot. Stir.
Lock on the lid and set the vent to sealing (if necessary for your model).
Press the pressure cook button and set the time to 1 minute. When done, allow for a 5 minute natural pressure release, then manually release remaining pressure.
Add the cheese and stir until melted.
Press the saute mode again and set it to low (if available on your model).
Stir together the corn starch and water in a small bowl. Pour it into the soup. Stir and cook for 2 minutes. Turn off saute mode.
When the boiling has stopped, pour in the cream or milk. Stir it all together. Serve immediately with extra cheddar cheese and red pepper flakes as garnish, if desired.
Notes
You want a pretty small chop on the veggies. I go with very small cubes for the onions and celery, and about 1″ sized chop on the broccoli.
The soup may be thin when it is finished cooking. If you want it more creamy and thick make a corn starch slurry. Mix equal parts corn starch and cold water. About 1 tablespoon is all that's needed, but if it's still not thick enough for you, you can add 2 tablespoons.
Watch the garlic closely so that it doesn't burn and become bitter.