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Puffed cereals are a type of breakfast cereal made by exploding cooked grains, such as wheat or rice, from a pressure chamber. This process causes the grain to expand to several times its original size. Early in the 20th century, patents were issued for puffed wheat and rice, and puffed oats and corn are now also produced. The method involves heating the cereal in a pressure chamber and then rapidly releasing the pressure, causing the water vapor to expand and puff the grains. The final product is toasted for crispness.12

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