I tried this quicker-cooking way of preparing Scottish oats (steel-cut oats). The night before, boil 4 cups of water. Remove pan frm heat. Add 1/4 cup oats and cover. Let sit overnight. In the morning, cook 9-12 minutes (may take longer for the groats, which are whole) over medium heat.
This makes 4 servings (but I eat it as 3). If you don't need that many at once, save the extra in the fridge, then reheat in a bit of milk of your choice the next day.