Air Fryer Reference
Sweet Potato
veggie · fresh
- Temperature
- 380 °F
- 193 °C
- Total time
- 40 min
- 2 medium sweet potatoes (about 8 oz each
- Flip at
- 20 min
- flip once
- Internal temp
- —
- use visual cue
Doneness
A paring knife sinks through the centre with no resistance from any angle — top, side, ends — not just 'mostly through' but cleanly through with the same easy slide as cutting butter. The skin has shrunk and wrinkled into the shape of the tuber, sugars caramelising into amber syrup at any natural cracks or fork-pierce holes, and the whole potato gives easily when gently squeezed through an oven mitt. A tuber that still resists the knife at 40 minutes needs another 5; one that sags and weeps syrup all over the basket is ready and should be pulled before the skin starts to burn.
Oil & seasoning
Rub the whole skin with 1 teaspoon olive oil and a generous pinch of flaky salt per tuber — the oil-and-salt rub is the whole technique for the crisp skin. Skipping this leaves the skin leathery instead of crackling-crisp.
Season with: flaky sea salt (in the oil rub, before cooking), black pepper after splitting, butter or olive oil after splitting, ground cinnamon (sweet finish), cumin + chili powder (savoury finish), tahini drizzle, maple syrup or brown sugar (sweet finish), fresh chopped chives or parsley.
Watch out for
- Pierce each tuber 4–6 times with a fork before loading. A whole intact sweet potato traps steam under high heat and can rupture loudly — the fork holes give the steam an escape path while the skin still crisps.
- Do NOT wrap in foil. Foil blocks the convection air that is the entire point of air-frying over oven-baking — the cook reverts to a slow steam-bake under foil and you've defeated the time saving. Bare-skin loading is non-negotiable.
- Match tuber size within an ounce or two in a batch. A 12-oz tuber loaded alongside two 6-oz tubers will still be undercooked when the smaller ones have over-caramelised and started to scorch — sort by weight on the kitchen scale before loading, or cook large and small batches separately.
- Don't skip the oil-and-salt rub on the skin. The skin is the best part once crisped (crackling-thin, salty, deeply flavoured) but bare unsalted skin steams to a leathery chew instead of crisping. One teaspoon of oil and a pinch of salt per tuber, rubbed all over before loading, is the difference between a sweet potato that gets eaten skin-and-all and one where the skin gets discarded.