- Breakfast food other than bread or cake made from cereal grains, principally, maize, rice, wheat, or oats. Some are cooked as needed, e.g. porridge, boiled rice and congé, others are commercially processed by precooking, pressing, drying and coating, e.g. cornflakes and rice crispies. Yet others use only a part of the cereal, e.g. bran flakes, and others are used raw such as rolled oats in muesli. Generally eaten with milk and sugar, possibly fruit and other flavourings.