Peel 3 large sweet potatoes and cut into ½-inch sticks. Place sweet potato fries in a large bowl and cover with cold water. Soak at room temperature for 60-90 minutes, or cover and refrigerate for up to 3 days.
When ready to bake the fries, preheat the oven to 425℉/215℃. Once preheated, brush a rimmed baking pan with 1 tablespoon extra virgin olive oil and place into the preheated oven for 5 minutes.
Drain the sweet potatoes from the soaking water and dry thoroughly with a clean kitchen towel.
In a gallon size bag, toss 1 tablespoon cornstarch , ½ teaspoon onion powder, ½ teaspoon garlic powder, and ½ teaspoon paprika. Add fries and toss to coat.
Carefully remove the heated pan from oven. Take fries out of the mixture, shaking off excess, and place evenly on the baking sheet, being sure to leave space around each fry. Drizzle with additional oil or nonstick cooking spray.
Bake for 20 minutes, then flip the fries, and bake for an additional 10 minutes.
Generously salt fries with 1 teaspoon kosher salt after they have baked. Serve immediately.
Notes
Soaking the sweet potatoes is a MUST to remove excess starch from the potatoes, this tip will help tremendously in achieving crispy sweet potatoes.Doubling the recipe: You will need to prepare 2 baking sheets, as you don't want your fries to be over-crowded and steam on the baking sheet. Oil: Be sure to use canola, extra virgin olive oil, vegetable, peanut, or coconut oil to cook these sweet potato fries, as those oils have a high smoking point which is necessary when baking at such a high temperature.