Shuck the corn and remove the silk. Place the trivet inside the Instant Pot and add 1 cup of water.
Place the corn on the trivet. Close the lid and set the valve to "sealing." Set the Instant Pot to "Manual" mode and cook on high pressure for 3 minutes.
Once the cooking time is up, do a quick release of the pressure by moving the valve to "venting." Carefully remove the lid and use tongs to remove the corn from the Instant Pot.
Serve each corn with 1 tablespoon of butter, salt, and pepper, and freshly chopped parsley if desired. Enjoy!
Notes
When picking corn, look for fresh, green husks without any dryness, yellowing, or brown areas. The stalk should be moist and not brown, and the corn itself should be light yellow and soft with lots of silk wrapped around it.
You can fit as many cobs as you can in your Instant Pot, depending on its size. An 8-quart pot can fit about 5 whole cobs; if yours is smaller, you may want to snap your cobs in half.
For crunchier corn, reduce the cooking time by 1 minute.
After cooking, you can keep the corn on the warm setting while serving to keep them from getting cold.