Prepare the ingredients: Rinse the broccoli and chop into evenly sized pieces. Chop the onion and mince the garlic. Measure the flour and broth
Set the Instant Pot to Sauté. Once hot, add the olive oil, onion, and garlic. Cook for 2–3 minutes, stirring, until softened and fragrant.
Add the broccoli and half of the broth. Lock the lid, set to High Pressure, and cook for 1 minute. (It will take about 8–10 minutes to come to pressure.)
Allow a 3–5 minute natural release, then carefully quick release the remaining pressure.
Whisk the flour into the remaining broth until smooth. Stir it into the soup and cook on Sauté for a few minutes, stirring, until slightly thickened.
Stir in the milk and cheese until melted and smooth. Adjust thickness with additional broth or milk, if needed. Season to taste and serve.
Notes
Substitutes:Frozen broccoli can be swapped for fresh 1/4 teaspoon garlic powder can be swapped with fresh garlicStore leftover soup in an airtight container for 3 to 4 days in the refrigerator.Thicken the soup if it's too thin by gradually whisking in more flour.Instead of adding more flour after cooking the soup, add 1/4 cup of leftover potatoes (mashed or baked are a great option for this), or Greek yogurt.