Sweet potato chunks in an air fryer
Fresh — the short answer
200°C (392°F) for 15–20 min
- For
- 750g in total, about 25mm at the thickest point
- In
- Dual-basket air fryer
- Published for
- Ninja Foodi Dual Zone AF300UK
- Preheat
- Not needed
- Part way
- shake the basket at about 8 min
- Check
- Caramelised at the corners without going black
Fresh sweet potato in 2.5cm chunks gets fifteen to twenty minutes at 200°C in one manufacturer's charts for two machines.
Manufacturer figures with no state given — 1 from a named machine, listed further down this page.
Fresh
The quick answer
200°C (392°F) for 15–20 min
Published range for 750g cut in 2.5cm chunks.
- Assuming
- 750g in total, about 25mm at the thickest point
- In
- Dual-basket air fryer
- Published for
- Ninja Foodi Dual Zone AF300UK
- Preheat
- Not needed
- Result
- Crisp outside, moist inside
Preparation
Cut in 2.5cm chunks and tossed in a tablespoon of oil, as the row prints.
About 15ml of oil.
While it cooks
At about 8–10 minutes: Shake the basket
The chart tells the owner to shake or toss the food often, and recommends shaking at least twice during the cooking cycle. It prints that beside the whole chart, not against this row, and gives no moments for it.
How to tell it is done
- Caramelised at the corners without going black
- A knife or skewer goes in with no resistance at the thickest point
- The cut faces have browned rather than merely softened
Other figures for this state
Ninja Foodi MAX Dual Zone AF400UK — dual-basket air fryer: 200°C for 18–20 min
Published range for a kilogram cut in 2.5cm chunks.
Where these figures came from — fresh
- Applies to
- Specific to this model
- Why this rating
- A published row from the manufacturer's own Quick Start Guide for this machine, under a block whose heading names the state. It is held as the chart prints it: its amount, its preparation and its oil where it gives them, and nothing where it does not.
- Last reviewed
- 2026-10-10
What this does not cover
- Published by the manufacturer for this model. It is evidence about this appliance and is not general advice.
- This machine has two drawers. The chart prints one amount for the row and does not say which drawer it is for, or whether it is for one drawer or both.
- The chart heads this block Fresh Vegetables, and the row is held as fresh on that heading. The word is the block's and not the row's own.
Sources (1)
Ninja Foodi Dual Zone Air Fryer AF300UK — Quick Start Guide and cooking charts
SharkNinja Operating LLC — Manufacturer cooking chart (United Kingdom)
Relied on for: The state, amount, temperature and time for sweet potato chunks.
States this directly
Passage read and verified
Retrieved 2026-10-10 from euronics.a.bigcontent.io
Retrieved from a retailer's document store, Euronics, which mirrors the manufacturer's booklet. Argos's manual library holds an earlier revision of the same guide, 200515_Mv1, which differs in a few printed amounts; the later revision is the one held here.
Chilled
Cooked as fresh: use the fresh figures above. Raw food sold chilled is the fresh state under another name, and the charts those figures come from start from fridge-cold.
Manufacturer figures with no state given
This is a published figure for one named machine. The manufacturer does not say whether this is fresh or frozen. So it is kept apart from the figures above, and not used as the answer for any of them.
Ninja Foodi MAX Health Grill & Air Fryer AG551UK: 200°C for 15–20 min
Published range for 750g cut in 2.5cm chunks.
What usually goes wrong
Blackened edges over an underdone middle. Sweet potato's sugar caramelises and then burns at a temperature the flesh is still working through, so a chunk cut much larger than 2.5cm cannot win.
Running the appliance safely
The rules for the machine are the same whatever is in it: plug it straight into a wall socket, leave clear space round it, do not overfill it, do not leave it running unattended, and unplug it at black smoke or an electrical smell. They are set out once, each with its source and what to do if it has already happened, and not repeated on every food. Every rule for running an air fryer safely.
One of them is about this food and not the machine: Aim for a golden yellow colour or lighter on starchy foods such as chips and roast potatoes, rather than a darker brown.
Sweet potato in fast-moving hot air
Sweet potato carries far more sugar and far less of the fine surface starch that makes a chip crisp. The sugar caramelises and then burns at temperatures a regular chip is perfectly happy at, which is why the published whole-roast figure is 190°C where a jacket potato is 200°C. The flesh also holds more water and less structure, so wedges soften rather than developing the fluffy interior a floury potato gives. A sweet-potato chip that is genuinely crisp is difficult and usually involves a coating.
Where to go from here
The pages that answer the questions this one tends to raise.
- How food actually gets crispyWhy patting it dry, spacing it out and a little oil are all the same instruction — so you can apply it when a page runs out.
- Why published timings differIf another chart says something else, this is usually why — and which one to believe.
Easily confused with
- Sweet potato wedges — A different cooking problem with a different answer.
- Squash chunks — A different cooking problem with a different answer.