One groat, three cuts:
Steel Cut Oats, also called Scottish or Irish oats, take the longest to cook and have a toothsome, chewy texture.
Old Fashioned Oats, also called Rolled or Whole Oats, take less time to cook than Steel Cut. They are heated in breakfast bowls and often used in baked goods.
Quick or Instant oats cook faster, absorb water faster and have a creamier mouthfeel than Old Fashioned or Steel Cut.