Combine the steel cut oats and water in the bowl of a 6-quart Instant Pot and give them a stir. Secure the lid and turn the steam release valve at the top to "Sealing." Press the Manual or Pressure Cook button to cook at high pressure for 4 minutes. The Instant Pot will read "ON" as it comes to pressure, which may take about 10 minutes. When the floating valve in the lid pops up, you'll know the pot is pressurized and the countdown will begin.
When the cooking cycle is complete, allow the pressure to naturally release for at least 15 minutes. Once 15 minutes have passed, turn the steam release valve to "venting" to release any remaining pressure. Carefully remove the lid and stir the oats to incorporate any water that has risen to the top. The oats will thicken as they cool; feel free to add extra water or your favorite milk to loosen the texture.
Serve warm with your favorite toppings. Leftover oats can be stored in individual containers in the fridge for up to a week, for a fast breakfast on the go.
