Thinly slice the sweet potatoes into even rounds, about 1/8 inch thick, using a mandoline slicer or a sharp knife. Uniform slices ensure even cooking and crispiness.

Place the sliced sweet potatoes in a large bowl. Drizzle with olive oil and toss until all slices are lightly coated. Sprinkle with BBQ seasoning and salt, then toss again to ensure each slice is evenly seasoned.

Preheat your air fryer to 380°F (193°C) for about 3-5 minutes. This helps to start the cooking process with the right temperature for crispy chips.

Place the seasoned sweet potato slices in a single layer in the air fryer basket, ensuring they don't overlap. You may need to cook them in batches depending on the size of your air fryer.

Air fry the sweet potato slices for about 10-15 minutes, flipping them halfway through the cooking time. The exact time may vary based on your air fryer model and how thick your slices are. Watch them closely towards the end to avoid burning.

The chips should be crispy and slightly browned when done. If they're not crispy enough, you can cook them for an additional 1-2 minutes, but keep a close eye on them to prevent burning.

Let the chips cool for a few minutes before serving. They will continue to crisp up as they cool down. Serve as a snack or as a side dish with your favorite dip.