Quick answer
Sweet potato cubes about 1/2 to 1 inch across cook in roughly 10 to 15 minutes at 400F in an air fryer, shaking or stirring halfway. Wedges and fries take a bit longer, and whole sweet potatoes can take 35 to 50 minutes depending on size. Cook until a fork slides in easily and the edges are browned.
Crispy sweet potato cubes
Ingredients: 1 to 2 medium sweet potatoes, 1 tablespoon oil, 1/2 teaspoon garlic powder, 1/2 teaspoon smoked paprika, 1/2 teaspoon salt, pinch of black pepper.
- Scrub the sweet potatoes, peel if you like, and cut into even 1/2 to 1 inch cubes.
- Toss with the oil and seasonings.
- Preheat the air fryer to 400F and spread the cubes in a single layer. Work in batches if the basket is crowded.
- Cook 10 to 15 minutes, shaking about halfway.
- Check that the edges are crisp and the centers are soft.
Even pieces matter: small bits burn while large ones stay firm.
Wedges and fries
Cut wedges about 3/4 inch thick, or fries about 1/2 inch thick. Wedges usually take around 15 to 20 minutes at 400F, and thin fries around 12 to 18 minutes, flipping or shaking partway. Fries are less likely to turn fully crisp than regular potato fries because sweet potatoes hold more sugar and moisture, so thinner, evenly cut pieces and a single layer help most.
Whole baked sweet potatoes
Scrub and dry the potatoes, prick them a few times with a fork, rub lightly with oil and salt, and cook at around 400F. Medium potatoes often need roughly 35 to 45 minutes, turning once. They are done when a knife slides in with no resistance. Larger potatoes need longer, so test early and often.
Why soak sweet potatoes?
Soaking cut sweet potatoes in cold water for 20 to 30 minutes washes off some surface starch, which can help fries crisp more. It is optional. If you soak, dry the pieces very thoroughly before adding oil, because water on the surface prevents browning. For cubes you will probably get good results without soaking.
Seasoning ideas
- Savory: garlic powder, smoked paprika, salt and pepper
- Warm and sweet: cinnamon with a pinch of salt
- Spicy: chili powder and a little lime juice after cooking
- Herby: rosemary or thyme with olive oil
Add honey or maple glaze only in the last minute or two, since sugar burns easily.
Air fry or bake
Air frying is quicker and gives crisper edges, particularly for cubes and wedges, and it avoids heating a full oven. Baking handles large batches better and is easy to do on a sheet pan. Both give tender results, so choose by how much you are cooking and how crisp you want the outside.
Tips for crisp results
- Cut evenly and keep pieces on the small side.
- Use only a light coating of oil.
- Do not overcrowd the basket.
- Shake or flip halfway.
- Preheat the air fryer.
What do doctors say about air fryers?
Air fryers use hot circulating air and far less oil than deep frying, so they can lower the amount of added fat in a meal. Sweet potatoes themselves are a source of fibre and vitamin A. There is no need to treat air frying as either harmful or magic. A varied diet matters more, and a doctor or dietitian can answer personal health questions.
Storing and reheating
Cool and refrigerate in an airtight container and eat within three to four days. Reheat in the air fryer at about 375F for a few minutes to crisp the edges again. They pair well with chicken thighs or chicken legs, and are an easy batch-cooked side for meal prep. For another quick snack, see air fryer kale chips. Sweet potato bites are also covered in our guide to Instant Pot healthy snacks.