2 pounds sweet potatoes, about 3 large ones
1/4 cup olive or other vegetable oil
1 teaspoon salt
1-2 tablespoon spice combination of your choice: chipotle powder, smoked paprika, Chinese five-spice, garam masala, Cajun seasoning, etc.
Preheat oven to 450°F. (For more crispiness, preheat your oven to 500°F.)
Peel the sweet potatoes and cut off the ends. Cut the potatoes in half lengthwise. Cut each piece into wedges. Alternately, you can slice the peeled sweet potato into disks either with a mandoline or a sharp knife.
Put the sweet potatoes into a large bowl and add the oil. Mix well to combine. Sprinkle with salt, sugar and spices of your choice. Mix well, so all pieces are coated with oil and spices.
Place a baking sheet inthe oven to preheat.
Spread the sweet potatoes out in a single layer on the preheating the baking sheet, to help the fries get crisp.
Bake for a total of 25 to 30 minutes. After the first 15 minutes, remove the baking sheet from the oven and turn over all of the sweet potato pieces. Return to the oven and bake for another 10-15 minutes, or until they are well browned. Let cool for 5 minutes before serving.