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Bring a medium-sized pot of water to a boil. Add the vinegar and a large pinch of salt.
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Add the sweet potato and boil for 6 minutes. Drain sweet potatoes when done.
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Whisk the cornstarch and water in a large bowl until smooth. Add the drained sweet potatoes and toss to evenly coat.
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Select the Preheat function on the Cosori Smart Air Fryer Toaster Oven, adjust temperature to 430°F, and press Start/Pause.
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Place the sweet potatoes in the fry basket in an even layer, then insert the basket at mid position in the preheated oven.
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Select the Air Fry and Shake functions, adjust time to 18 minutes, and press Start/Pause.
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Flip sweet potatoes halfway through cooking. The Shake Reminder will let you know when.
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Remove when sweet potato fries are crispy and golden, then sprinkle with salt and serve.
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