Peel and cube the sweet potatoes into 1/2-inch pieces.
Transfer the cubes to a bowl. Add the avocado oil, garlic powder, salt, and pepper. Toss to coat everything evenly.
Preheat your air fryer to 400°F.
Spread the sweet potatoes into a single layer in the basket. Avoid overcrowding—work in batches if necessary.
Cook for 10-12 minutes, shaking the basket halfway through. Remove when the pieces are golden and crisp.
Oven Variation: Preheat oven to 425°F. Spread the seasoned potatoes on a sheet pan and cook for 25-30 minutes, flipping every 10-15 minutes.