Our pick
Refillable glass oil spray bottle (300ml)
Why we picked it
- A fine, even coat uses far less oil than pouring it
- No aerosol additives, which can build up on non-stick coatings
- Reusable and easy to refill with your own oil
Worth knowing
- Use plain oil, and rinse the nozzle now and then so it doesn’t clog
- A light coat is enough. Choice’s guideline is up to a tablespoon of oil per kilo of fresh food
Paid link
The chips came out limp. The chicken skin is pale and rubbery. Or you’ve got a basket where half of it is crisp and half is steamed. An air fryer is meant to deliver crunch, so when it doesn’t, it’s easy to blame the machine.
Usually it’s not the machine. Consumer testers keep finding the same handful of causes, and each has a quick fix. This guide matches the symptom to the cause.
Find your symptom

| What you see | Likely cause | What to do |
|---|---|---|
| Soggy, steamed outside | The basket is too full, or the food is wet | Spread food in a single layer, pat it dry, and cook in batches |
| Pale, not browned | Not hot enough, or the air fryer wasn’t preheated | Preheat for a few minutes, add a little time, or raise the temperature slightly |
| Greasy | Too much oil | Use a light coat only |
| Crisp in places, soft in others | The food wasn’t shaken or turned | Shake the basket or turn the food partway through |
| Dry or burnt outside, raw inside | Too hot for how thick the food is | Lower the temperature, cook a little longer, and check the middle |
| Coating blown or fallen off | Loose crumbs, or a coating that isn’t pressed on | Press the coating on firmly, and don’t use wet batter |
The big one: overcrowding
An air fryer works by moving hot air around the food. If pieces overlap or the basket is packed, the air can’t reach the surfaces, so the food steams in its own moisture instead of crisping. As Choice, the Australian consumer group, puts it, giving ingredients space lets air circulate, so you get crispy food rather than steamed food. If anything overlaps, you’ve got too much in. Cook in two batches instead.

Moisture is the quiet culprit
- Pat food dry with kitchen roll before it goes in, especially chicken skin, potato wedges and vegetables you’ve washed.
- Drain marinades, and wipe off excess before cooking.
- Skip wet batter. Choice notes that an air fryer doesn’t handle wet batters like tempura the way a deep fat fryer does.
- Cook wet foods separately, or add them near the end.
Preheating and shaking
Choice advises always preheating before cooking fresh produce, so the food hits the right temperature from the start. Some makers’ guides suggest three to five minutes, so check your manual. For even browning, shake the basket or turn the food partway through. Choice suggests every five minutes, which is a good habit with chips.
How much oil is the right amount?
Less than you think. Choice gives a guideline of up to one tablespoon of oil for one kilo of fresh food. Too much makes food greasy and can make the fryer smoke. Many frozen foods are lightly oiled already, so check the packet before adding any.
Is your basket simply too small?
Capacity in litres can mislead. Choice points out that a 10-litre lid-opening model might only fit 500g of chips in its basket. Judge by the floor area of the basket rather than the number on the box. If you regularly cook for four, a bigger or dual-drawer model avoids the batch problem. Our guide to single basket or dual drawer air fryers helps you choose.
Run a simple test batch
- Use a bag of frozen chips, so you’re not guessing at times.
- Preheat the air fryer for a few minutes.
- Spread the chips in a single layer, with no overlap.
- Shake the basket about halfway through, and check a few minutes before the packet time.
- If they still aren’t crisp, change one thing at a time: cook fewer, add a little time, or raise the temperature slightly.
Changing one variable at a time shows you which of the causes is yours, instead of fixing three things at once and not knowing which helped.
Still not working?
- Check the foods themselves. Our guide to what to cook in an air fryer lists what suits it and what doesn’t.
- Check your times and temperatures against converting oven recipes for the air fryer.
- Make sure the basket and drawer are clean. Old grease can smoke and affect results.
Helpful extras
More airflow
Tala stainless steel 2-tier air fryer rack
Good for: raising food off the base so air reaches more of it, and fitting more in without piling.
Not ideal if: your basket is small. Check the rack’s size against yours before buying.
Paid link
A bigger basket
Ninja Foodi MAX Dual Zone air fryer (AF400UK, 9.5L)
Good for: families who keep overcrowding a single basket, with two drawers to spread the load.
Not ideal if: you cook for one or two. A smaller fryer is cheaper and takes up less space.
Paid link
Air fryer crispiness: common questions
Should I put oil on frozen chips?
Many are lightly oiled already, so check the packet. If they’re very dry, a light spray helps, but too much makes them greasy.
Why is my air fryer smoking?
It’s often fat dripping onto a hot surface, or old grease on the basket or drawer. Clean the parts, use less oil, and check your manual if it continues.



