Well we have potatoes and baked potatoes so why not? The Recipe for it would be a shovel surrounded by baked potatoes, but when made the shovel is not consumed. Mashed potatoes restore 6 hunger and 2 health. What do you think minecraftia?
How about combining two potatoes and a wooden bowl to make a bowl of mash? it would effectively allow you to stack a lot of edibles if it simply restored twice as much as the normal potatoes. The idea of the item is to compact and transport more edibles.