We've been making a version of this for years finally stumbled upon a recipe that we really like:
2 sweet potatoes (peeled)
extra virgin olive oil
Cut the sweet potatoes into strips and place on a baking sheet. Pour a generous amount of olive oil over the sweet potatoes and use your hands to completely cover the potatoes in oil. You should have olive oil all over your hands. There should even be a thin layer of oil across the bottom of the pan.
Salt and Pepper to taste
20 minutes in oven at 400 degrees.