If you like, you can, of course, deep-fry these crisps rather than bake them in the oven. In that case, it is best to deep-fry them twice to make them extra crispy.
Brush the trays with a little olive oil; alternatively, and even better, spray with olive oil, as it is better to use as little oil as possible to get the crisps really crunchy. Arrange the sweet potato slices on the baking trays, being careful to avoid any overlap. Brush or spray the sweet potato slices with a little olive oil and season with sea salt and cayenne pepper or paprika.
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