For each cup all-purpose white flour, one of the following may be
subsitituted from the above list. Cornstarch, potato starch,
arrowroot, or instant potato flakes will thicken gravies and
puddings. And in most recipes calling for bread crumbs, you can
substitute pure rye bread crumbs, crushed rye wafers, corn flakes,
potato chips, instant potato flakes, or cornmeal.
For further reading, get Marion Wood's '