Rolled oats are oat groats that are dehusked and steamed, before being rolled into flat flakes under heavy rollers. Thick-rolled oats are large whole flakes, and thin-rolled oats are smaller, fragmented flakes. Rolled whole oats, without further processing, can be cooked into a porridge and eaten as old-fashioned oats. Rolled oats are most often the main ingredient in granola and muesli.
Oats, or Avena sativa, is a species of cereal grain grown for its seed. Oats is sold in many forms, as groats (whole), steel-cut (cut groats), rolled (flattened), crushed (quick oats) or ground into flour. Oats are a source of protein, thiamine, iron, and are a near equivalent in quality to soy protein.
Oats are often boiled and eaten as porridge, but can also be baked into savoury foods and desserts, or made into plant milk.