Peel sweet potatoes and cut into fries. I would recommend checking out youtube on how to cut sweet potatoes into fries because this was very helpful! Soak sweet potatoes in cold water for one hour.

Preheat oven to 450 degrees F. Line two baking sheets with foil and spray with non-stick cooking spray. Rinse/Drain sweet potatoes and pat dry with paper towels. Place in large Ziploc bag and add corn starch. Shake bag around until all the sweet potatoes are coated with corn starch. Smooth out any clumps that have formed.

Transfer sweet potatoes to a large bowl and drizzle with olive oil. Toss sweet potatoes around with your hands to ensure all of them are well coated with the oil. In a separate small bowl, combine chili powder, paprika, salt, coriander, cumin and black pepper. Sprinkle seasonings over sweet potatoes slowly and make sure all of the sweet potatoes are seasoned evenly.

Place sweet potatoes on baking sheets in a single layer. Do not let them touch each other. To prevent fries from burning, place sheets near the top of the oven. Bake for 15 minutes. Toss sweet potatoes around using a spatula and spread back into a single layer. Bake for an additional 15 minutes.

Let cool for 5 minutes.