Cornflake crumb is crushed cornflakes, used as a coating or topping ingredient rather than eaten as cereal. It is typically made by crushing whole cornflakes to a coarse or fine crumb.
In savory cooking, it is used as a crunchy breading for fried or baked chicken, fish, and vegetables, or as a topping for casseroles like macaroni and cheese. In sweet applications, it is mixed with melted butter and used as a crust or topping for pies, tarts, and other baked desserts, and can be seasoned with sugar and cinnamon or with herbs and spices depending on the dish.