Slow Cooker Oatmeal Recipe: Combine all ingredients in a slow cooker or crock pot, put on the lid, and cook on low heat for three hours. No need to stir or anything until the time is up! I use a 3-quart slow cooker for this recipe; cooking times may vary if you use a much-larger size. If you double the crock pot oatmeal recipe, cook for 5-6 hours on low. (If you don't own a slow cooker, you can of course still make steel cut oatmeal. Just follow the cooking directions on the package of oats.)View Nutrition Facts