You can make decent "chips" out of gram flour (chickpea flour). They were a bit too soft first time I tried it but I must have another go. Thinking of making some polenta wedges to have with an avocado dip tomorrow if I can find a couple of ripe 'n' readies. You can't trust 'em. I know I'm not supposed to but I never buy an avocado that I haven't given just a little squeeze...