Pour your frozen sweet potatoes into your air fryer basket and set it to preheat at 400°F (205°C) for 4 minutes. This will get any frostbite off and break the pieces apart before seasoning, but let them go much longer than 4 minutes and the potatoes will start cooking and stick to the basket.
While your frozen sweet potato is heating up, gather your oil, salt, and seasoning of choice (I like ½ teaspoon za'atar & ½ garlic powder). Once the preheating is complete, carefully scoop your warm sweet potatoes into a small bowl and pat them dry with a dishtowel or several paper towels (this took me about 2 minutes); this is integral to getting them crispy. Toss any water left in the bottom of the air fryer after preheating.
Then drizzle the oil, salt, and seasoning over the sweet potatoes and stir or toss them in the bowl until well-combined (about 30 seconds). If using only 1 teaspoon of oil, spray the inside of your air-fryer basket with a tolerated oil spray; otherwise just proceed to pouring in the pieces.
Arrange the sweet potatoes in as thin a layer as possible, though a bit of overlap is okay, and then put back the frozen sweet potato in air fryer for another 15 minutes at 400°F (205°C). Take out your crispy bits and taste one, then add extra salt (if needed) & enjoy!