Oatmeal is a small grain with really big power. It is made from the whole grain of oats and is used either as a pithy, tender or in the form of melted flakes. It is the basic ingredient for classic porridge or overnight oats, which consist of milk or water alongside oat flakes. Delicate oat flakes are best suited for overnight oats or porridge, as they swell well when mixed with liquid and still retain some bite.