While the Instant Pot method is best for steel-cut or longer cooking oats, you can use it to make a huge batch of oatmeal in a fraction of the time. Cinnamon and brown sugar are all you really need here to accent the creamy texture.
Stir together all ingredients in the Instant Pot; secure the lid. Set to high pressure for 5 minutes (Instant Pot will take about 5 minutes to build pressure before counting down).
Follow manufacturer’s instructions for manual release. Using a rubber spatula, gently stir, scraping any oatmeal beginning to stick to the pot. Top with fresh fruit and nuts, if desired.