oat flakes

n. whole oat kernels steamed and flattened and then flaked to keep most of their nutrition value (white to golden color and used in cereals, baking etc.)

In the United States and Canada, oatmeal means any crushed oats, rolled oats, or cut oats used in recipes such as oatmeal cookies. Oatmeal is a product made by processing oats. Oatmeal is coarsely ground unsifted oats. Rolled oats and steel-cut oats are also called oatmeal. The porridge made from this is also called oatmeal or oatmeal cereal. However in other parts of the English-speaking world, oatmeal means coarsely ground groats (i.e. oat-, cf. cornmeal, peasemeal, etc.). The groats are coarsely ground to make oatmeal, or cut into small pieces to make steel-cut oats, or steamed and rolled to make rolled oats. The quick-cooking rolled oats are cut into small pieces before being steamed and rolled. Oatmeal porridge contains more B vitamins and calories than other kinds of porridges. Oatmeal is used in some alcoholic drinks, cosmetics, soaps, external medical treatments, and is sometimes an added flavour in canned animal products. It is also used as a thickener in some brands of canned chili con carne.
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