Start by preparing your sweet potatoes.
Peel the sweet potatoes with a potato peeler or a small paring knife.
Slice the peeled sweet potatoes into ½-¾ inch or 1.5-2 cm wide slices.
Next, cut these slices into ½-¾ inch or 1.5-2 cm thick slabs.
Finally, dice these slabs into ½-¾ inch or 1.5-2 cm cubes.
Place the cubes in a bowl, and season with salt and optionally black pepper. This step can be skipped if preferred.
Drizzle about 1 tablespoon of olive oil per sweet potato over the cubes, adding a bit more if you like, and mix well.
Transfer the seasoned sweet potato cubes to the air fryer basket.
Set the air fryer to 400°F (200-205°C) and cook for 17 minutes.
After 17 minutes, check the cubes. They should have begun to brown. For more browning, return them to the air fryer for an additional 1-2 minutes.
Serve the sweet potato cubes immediately. They are excellent alone or as a side with roasted meats and a crisp salad.