Slice sweet potatoes into desired shape (wedges, fries, rounds).
Soak in coldest water you can get for at least 10-30 minutes.
Preheat oven to 425 degree F.
Line a baking sheet with parchment paper.
Once potatoes are done soaking, lay on top of a clean towel or a few slices of paper towel. Pat dry.
Either put potatoes back in dry bowl, or lay on baking sheet. Pour oil, salt and pepper over. Toss to evenly coat potatoes.
Distribute evenly across baking sheet, making sure that each piece has a little room around it. You don't want to crowd them because the potatoes will steam instead of bake.
Bake for one hour or until slightly crispy. Check on them once or twice throughout the baking process.
Serve immediately.