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Scrub the potatoes and cut them into quarter-inch sticks, then place them in a bowl of cold water.
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Whisk the sugar, paprika, salt, pepper, garlic powder, onion powder, oregano, thyme, and red pepper flakes in a separate bowl.
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Preheat the air fryer to 400°F.
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Drain and pat the potato sticks dry, then put them in a bowl. Add oil and about three-fourths of the spice mix, and toss.
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Place the potatoes in the air fryer. Cook for 15 to 18 minutes, stirring once halfway through.
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If not crisp enough, raise the temperature to 425°F and cook for an additional 3 to 5 minutes.
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Sprinkle with the remaining spice mix and toss again.