Instant Pot Oatmeal Recipe : Stirring helps break up all those bubbles before they get too big, so you’re less likely to end up with an explosion. If you’re microwaving, keep a close eye on your oats and give them a good stir every 45 seconds or so. If you’re cooking on the stovetop, just stir your porridge frequently. Directions: Bring water or milk to a boil in a medium saucepan. Stir in oats, reduce heat to low. Simmer uncovered over low heat, stirring occasionally, for 25-30 minutes or until oats are of desired texture.