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1 Pre-heat the oven to 400 degrees Fahrenheit. 2  Cut the potatoes into French fries (see photos in post). 3  Line a large cookie sheet with parchment paper. 4  Place the fries on the parchment paper and add the oil and all of the seasonings. 5  Toss to make sure all the fries are coated evenly.
Instructions. How to make crispy sweet potato fries: Preheat oven to 400F and grease a baking sheet. Cut the potatoes into fry shapes (thick or thin), then soak them in water for around 45 minutes.nstructions. How to make crispy sweet potato fries: Preheat oven to 400F and grease a baking sheet. Cut the potatoes into fry shapes (thick or thin), then soak them in water for around 45 minutes.