The file
Little slices of toast, complete with crust, tasting of maple and cinnamon. The shape did most of the work; kids ate it for the novelty of eating miniature breakfasts inside a breakfast.
It vanished from U.S. shelves in 2006 and, like Dunkaroos, kept going in Canada, which fed a decade of border runs and forum posts. General Mills brought it back in 2014 and it's stayed.
Back on shelves, still shaped like toast.
Sources: Wikipedia — French Toast Crunch
