Add 1 cup of cool water to the insert of a 6-quart Instant Pot (or 1 ½ cups for an 8-quart model).
If desired, add the salt to the water and stir to combine. This step is optional.
Add a steamer basket insert into the Instant Pot and place the broccoli florets inside.
Secure the lid on the Instant Pot and flip the valve to “sealing”.
Select the steam function for your Instant Pot, and select the time to read “0”. If you do not have a steamer function on your pot, you can use manual mode instead.
Once the pot beeps to indicate it has reached pressure and is switching over to warm, turn the pot off and flip the valve to “venting” to do a quick pressure release.
After all of the pressure has been released, carefully open the lid and remove the steamer basket.
Serve immediately.