1). Wash and peel your sweet potatoes
2). Slice thinly
3). Soak in water to remove starch (Maybe 1 to 2 hours)
4). Dry slices on paper
5). Deep fry until crisp
6). Drain excess oil on paper towel
7). Sprinkle with salt
A good variation on this is to use green eating bananas (These are the same bananas that turn yellow and you eat them in the morning) but get them when they are really green. You can also use plantains which are specifically used for cooking (or any other cooking banana). Peel, slice and fry. Dip them in your favorite sauce.