Frozen roast potatoes in an air fryer
From frozen — the short answer
190°C (374°F) for 20 min
- For
- 700g in total, From frozen
- In
- Dual-basket air fryer
- Published for
- Ninja Foodi Dual Zone AF300UK
- Preheat
- Not needed
- Part way
- shake the basket at about 10 min
- Check
- A crisp shell that shatters under a fork
- Safety
- Food cooked from frozen must reach the same core temperature as the same food cooked fresh — the frozen centre is the last thing to get there. Full rule below.
Fifteen to twenty minutes at 190–200°C from frozen, in one manufacturer's charts for two machines.
From frozen
Before anything else
From national food-safety authorities, not from us. These take precedence over any cooking time below.
Requirement — Food safety (microbiological)
Food cooked from frozen must reach the same core temperature as the same food cooked fresh — the frozen centre is the last thing to get there.
Target: 70°C in the thickest part.
How to tell, without a thermometer
- No ice or cold spot at the centre when the thickest piece is cut open
- Steaming hot throughout, tested in the middle rather than the edge
If it has not got there: Reduce the temperature by 10–20°C and give it longer. A lower set point lets the centre catch up before the surface passes the point of no return, and it is the single most useful adjustment for cooking from frozen.
Important: If the packaging says the product must be thawed before cooking, follow it. That instruction exists because the manufacturer has tested cooking it from frozen and it did not reach temperature reliably.
The quick answer
190°C (374°F) for 20 min
A single published time for 700g of roast potatoes from the chart's frozen block, not a range.
- Assuming
- 700g in total, From frozen
- In
- Dual-basket air fryer
- Published for
- Ninja Foodi Dual Zone AF300UK
- Preheat
- Not needed
- Result
- Crisp outside, moist inside
Preparation
Frozen, with no oil and no preparation, as the row prints.
No oil needed.
While it cooks
At about 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
- A crisp shell that shatters under a fork
- Fluffy inside with no cool centre
Other figures for this state
Ninja Foodi MAX Health Grill & Air Fryer AG551UK — multicooker with air fry: 200°C for 15–18 min
Published range for 700g, from the chart's frozen block.
Where these figures came from — from frozen
- 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 Frozen Foods, and the row is held as frozen on that heading.
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 frozen roast potatoes.
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.
What usually goes wrong
Pale and soft, from crowding. The coating on these is designed to crisp in dry air with nothing added, and it needs air on every face to do it — a heaped basket produces the one result the product exists to avoid.
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.
Potato in fast-moving hot air
A potato is mostly water held in a starch matrix. Heat gelatinises the starch and drives water out of the surface layer; when that dehydrated layer is thin, dry and hot enough it becomes crisp. The whole game is getting water away from the surface faster than it arrives from inside, which is why crowding a basket produces soggy chips — the escaping steam has nowhere to go and condenses back onto the food. Sugar content decides browning speed, which is why some potatoes darken far faster than others at the same setting.
Where to go from here
The pages that answer the questions this one tends to raise.
- Using a thermometer, and where to put itThe times above are for a piece that is not the one you are holding. A probe measures yours, which is what the safety rule on this page asks for.
- 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.
- Cooking from frozenUsually cooler and longer than the same food fresh, and never worked out from the fresh figure.
- Why published timings differIf another chart says something else, this is usually why — and which one to believe.
Easily confused with
- Roast potatoes — A different cooking problem with a different answer.
- Frozen chips — A different cooking problem with a different answer.