• Cut sweet potatoes into slices using a mandoline and then cut the slices into sticks about ¼" wide.
• Add the potato sticks to a large bowl and soak for at least 30 minute, up to overnight.
• Drain and dry potato sticks on paper towels, then toss with olive oil in a large bowl.
• Mix cornstarch, spices, and pepper (but NOT salt). Sprinkle over potatoes and toss to coat, ensuring that the cornstarch has soaked up any extra oil on the fries.

Air Fryer Instructions

• Preheat the air fryer to 380ºF. Divide the fries into 3 even groups. Place the first batch of seasoned sweet potato fries in the air fryer basket, leaving lots of space for air to flow around them.
• Air fry sweet potato fries for 12 minutes, turning halfway through.
• When the fries are done, allow them to rest for 5-10 minutes, then sprinkle with salt and serve.

Oven Instructions

• Preheat oven to 425ºF. Line a baking sheet with parchment paper. It's important to use a large baking sheet or two medium ones because the potatoes must be in a single layer in order to get crispy.
• Spread potatoes in a single layer on the prepared baking sheet.
• Roast sweet potatoes until brown and crispy on the bottom, about 15 minutes. Flip and cook on the other side about 10-15 minutes more. You want them to be crispy and just starting to brown.
• When the fries are done, allow them to rest for 5-10 minutes, then sprinkle with salt and serve.