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Peel each sweet potato and slice into even 1/4-inch thick planks, then into 1/4-inch thick fries.
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Submerge sweet potatoes in large bowl of hot tap water and let them sit for 10 minutes. Drain potatoes, transfer to paper towel–lined rimmed baking sheet, and thoroughly pat dry.
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Toss sweet potatoes with 1 teaspoon of the oil in a clean, dry bowl, then transfer all to the air fryer basket.
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Place basket in air fryer (no need to preheat) and air fry 350F degrees 8 minutes, then shake and cook, 5 more minutes.
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Transfer sweet potatoes back to the empty bowl and toss with the remaining oil, salt and spices.
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Spray the basket with oil and return the sweet potatoes to the air fryer.
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Increase the temperature to 380F degrees, and cook until golden brown and crisp, about 4 to 5 minutes, shaking the basket halfway.
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Transfer sweet potato fries to large plate and serve right away with your favorite dipping sauce.