Wash the broccoli and cut it into equal large size florets.
Add water to the instant pot insert. Place the steamer basket in the instant pot insert.
Spread the broccoli florets on the steamer basket.
Start the instant pot and set it on manual or pressure cook mode for 0 minutes on high pressure with vent in sealing position. (Update: Many readers enjoy crunchier broccoli, for which 0 minutes at low pressure works great)
When the instant pot beeps, quick release the pressure manually. Remove the steamer basket carefully as it is hot.
You can place this basket under cold water for a minute to stop the cooking (optional) or just eat the broccoli right away.