Oats vs Groats
Oats are whole grains used in cereals, breads and other baked goods. When the husk is removed from the oat kernel, the kernel is called an oat groat. Steel cut oats (AKA Irish oats) are groats that have been toasted and cut into small pieces by steel blades. They have a heartier texture, a nutty taste and take about 30 minutes to cook.
Rolled or old-fashioned oats are steamed groats that have been rolled into flakes. Quick-cooking oats are rolled oats cut into smaller pieces so they cook faster. Instant oats are partially cooked and dried before being rolled into flakes. You can use quick-cooking and rolled oats interchangeably. Instant oats aren’t well-suited for using in recipes.