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Portobello mushrooms in an air fryer

Fresh — the short answer

180°C (356°F) for 10–12 min

For
250g in total
In
Dual-basket air fryer
Published for
Ninja Foodi MAX Dual Zone AF400UK
Preheat
Not needed
Part way
shake the basket at about 5 min
Check
The cap has shrunk and darkened
Moderate confidenceWell supported, but from a narrower base of sources than we would like.

Fresh whole portobello mushrooms get ten to twelve minutes at 180°C in one manufacturer's chart; its grill chart for another machine names no state.

Manufacturer figures with no state given — 1 from a named machine, listed further down this page.

Fresh

The quick answer

180°C (356°F) for 10–12 min

Published range for 250g of whole portobello mushrooms. The row prints no count.

Assuming
250g in total
In
Dual-basket air fryer
Published for
Ninja Foodi MAX Dual Zone AF400UK
Preheat
Not needed
Result
Browned but not crisp
Moderate confidenceWell supported, but from a narrower base of sources than we would like.

Preparation

Whole and brushed with oil, as the row prints. Its oil column says one tablespoon.

About 15ml of oil.

While it cooks

  1. At about 5–6 minutes: Shake the basket

    The chart tells the owner to shake or toss often unless the preparation column says otherwise. It prints that beside the whole chart, not against this row, and gives no moments for it.

How to tell it is done

  • The cap has shrunk and darkened
  • No pool of liquid left in the gills

Where these figures came from — fresh

Moderate confidenceWell supported, but from a narrower base of sources than we would like.
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 MAX Dual Zone Air Fryer AF400UK — Quick Start Guide and cooking charts (PDF)

    SharkNinja Operating LLC — Manufacturer cooking chart (United Kingdom)

    Relied on for: The state, amount, temperature and time for portobello mushrooms.

    States this directly

    Passage read and verified

    Retrieved 2026-10-10 from argos-support.co.uk

    Retrieved from Argos's manual library for Argos product 952/3997, published there alongside the instruction booklet as the product's quick start guide.

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: 260°C for 7–9 min

    Published for six caps weighing 350-450g between them.

What usually goes wrong

A puddle. A portobello releases a lot of water from its gills, and gills-up it collects there and boils; gills-down it drains and the cap browns.

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.

Mushrooms in fast-moving hot air

A mushroom is a sponge of around ninety per cent water held in a protein structure that contracts sharply when heated. In moving air it expels that water fast, and if the air can carry it away the mushroom browns and concentrates; if it cannot, the mushroom sits and boils in its own liquid. That is the whole difference between a good air-fried mushroom and a grey one, and it is decided by how many are in the basket rather than by time or temperature.

More on mushrooms

Where to go from here

The pages that answer the questions this one tends to raise.

Easily confused with