Air-fry sweet potato cubes (2cm / ¾ inch) at 200°C / 400°F for 15 to 18 minutes, shaking halfway. For fries cut to 1cm / ⅜ inch, 12 to 15 minutes. Whole sweet potatoes (250g / ½ lb each) take 35 to 45 minutes — pierce with a knife to test. Toss with oil and salt before cooking; the natural sugars caramelise into crisp dark edges.
| Size | Time |
|---|---|
| Fries (1cm / ⅜ inch sticks) | 12–15 min |
| Cubes (2cm / ¾ inch) | 15–18 min |
| Wedges (1.5cm / ½ inch thick) | 18–22 min |
| Whole, medium (250g / ½ lb) | 35–45 min |
Cubes and fries should be deeply caramelised on the outside and tender all the way through. Whole sweet potatoes are done when a knife slides into the centre without resistance — usually 35-45 minutes for a medium one. The skin should be wrinkled and the flesh soft enough to mash.
Sweet potato has more natural sugar than regular potato — about 5% versus less than 1%. At high heat in an air fryer those sugars caramelise on the surface, creating the dark, crisp edges that make air-fried sweet potato taste like dessert. The Maillard reaction also kicks in, producing roasted, savoury notes alongside the sweetness.
Read the science →No, the skin crisps up nicely and is good for you. Just scrub it well first. The only time peeling matters is for purées or smooth mash — for cubes, fries, or whole baked, leave the skin on.
Probably crowding or cuts that are too thick. Sweet potato has more moisture than regular potato — give the fries space to vent steam, and keep cuts under 1cm / ⅜ inch thick for proper crisping.
Yes — pierce it with a fork in 4-5 spots, optionally rub with a little oil and salt, and cook at 200°C / 400°F for 35-45 minutes depending on size. Done when a knife slides in with no resistance. Skin will wrinkle and crisp.
Optional. Soaking 30 minutes in cold water then drying thoroughly removes some surface starch and can give a slightly crispier result. But unlike white potato fries, sweet potato fries don't need this step — the natural sugars caramelise enough to give crisp edges either way.
Cooking times are starting points compiled from authoritative sources and verified against the Renardo Cuisine air fryer testing chart. Your appliance wattage, food thickness, and starting temperature may shift results — always verify protein doneness with an instant-read thermometer.
