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Preheat oven to 450F (For more crispiness, preheat your oven to 500F.
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).
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2 Peel the sweet potatoes and cut off the ends.
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Cut the potatoes in half lengthwise and then, if they are very long, in half crosswise.
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Cut each piece into wedges.
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Alternately, you can slice the peeled sweet potato into disks either with a mandoline or a sharp knife.
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3 Put the sweet potatoes into a large bowl and add the oil.
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Mix well to combine.
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Sprinkle with salt, sugar and spices of your choice.
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Use your hands to mix well, so all pieces are coated with oil and spices.
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Spread the sweet potatoes out in a single layer on a baking sheet; the oil they are coated with should keep them from sticking to the pan.
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If you are trying to cut fat, reduce the oil to 2 Tbsp and use a non-stick coating on the baking sheet.
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(Note: a commenter has recommended putting them on a wire cooling rack on top of a baking sheet, so that the oven air circulates around the sweet potato pieces and you don't have to turn them in the next step.
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Another commenter recommends preheating the baking sheet, to help the fries get crisp.
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).
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5 Bake for a total of 25 to 30 minutes.
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After the first 15 minutes, remove the baking sheet from the oven and turn over all of the sweet potato pieces.
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Return to the oven and bake for another 10-15 minutes, or until they are well browned.
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Let cool for 5 minutes before serving.
