Peel and cut sweet potatoes into 1/2″ fries (try not to make thinner, or thicker) . Soak in water for minimum of one hour.
When ready, drain water from bowl and lift fries out by the handful. Shake off excess moisture but don't completely dry. Put cornstarch in a ziplock bag and add fries. Keep a bit of air in the bag before securing shut and shake vigorously.
Transfer to baking sheets, try not to overcrowd. Coat with melted coconut oil.
Bake for 15 minutes at 425° F. Once bottom of fries are crisp, flip them over and cook for another 5-10 minutes.
The longer you can soak your fries, the better!
Adapted from Oven-Baked Crispy Sweet Potato Fries