How to reheat leftovers in an air fryer

Leftovers are where an air fryer earns its counter space. A microwave heats food by agitating the water inside it, which is fast, but it turns crisp things soft and chewy. An air fryer heats from the outside with fast hot air, so surfaces dry out and crisp again while the inside warms through. It is slower than a microwave and faster than an oven, and for anything that was crisp the first time, it is the best tool in the kitchen.

What reheats well, and how

These are starting points for basket air fryers. Models differ, so check a minute early and add time in short steps. Every item should end up steaming hot in the centre.

Lower temperatures are your friend when reheating. The food is already cooked; the job is to heat the centre and re-crisp the outside, not to brown it further. At high heat, the outside dries out and darkens before the middle is warm.

What to reheat somewhere else

• Soups, sauces, stews and gravies. They need to be heated in a pan or the microwave. The US Department of Agriculture advises bringing sauces, soups and gravies to a rolling boil when reheating them¹.
• Rice and pasta dishes. They dry out in moving air. A covered dish in the microwave with a splash of water, or a pan, works better.
• Large, dense dishes such as lasagne, shepherd's pie or a whole roast. The top can scorch before the centre is hot. Use the oven, covered, or the microwave, then crisp the top in the air fryer for a couple of minutes if you like.
• Anything in a container not made for it. Only use dishes the maker says can go in the air fryer, and never plastic tubs.

The food safety rules for leftovers

Reheating safely starts long before the reheating.

Chill it quickly. Bacteria grow fastest between about 4 and 60 °C (40 and 140 °F), so cooked food should go into the fridge within two hours of cooking or of coming off a hot plate¹. Big batches cool faster if you divide them into shallow containers¹.

Eat it within a few days. The USDA's guidance is three to four days in the fridge, or three to four months in the freezer for best quality; frozen food stays safe indefinitely but loses moisture and flavour over time¹. The UK Food Standards Agency is stricter: eat leftovers within 48 hours, or freeze them if you will not manage that².

Rice is the exception. The UK Food Standards Agency explains that uncooked rice can contain spores of a bacterium called Bacillus cereus that survive cooking; the longer cooked rice sits at room temperature, the more likely bacteria or their toxins make it unsafe³. Its advice: chill leftover rice as quickly as possible, ideally within an hour, keep it in the fridge for no more than a day, never reheat it more than once, and make sure it is steaming hot all the way through when you do³.

Reheat once. The FSA also says previously cooked and frozen meat should only be reheated once³. Reheat the portion you are going to eat, not the whole container.

Heat it all the way through. The USDA's target for reheated leftovers is 74 °C (165 °F) measured with a food thermometer¹. The FSA's version is that food should be steaming hot all the way through, with steam rising from the middle when it is cut⁴; in temperature terms, the centre should reach 70 °C for two minutes, or an equivalent such as 75 °C for 30 seconds⁴.

Using a thermometer on leftovers

A probe thermometer takes the guessing out of reheating, especially for chicken and thick pieces. Push the probe into the thickest part of the food, away from bone; for thin pieces, go in from the side until the tip reaches the middle⁵. If it reads below 74 °C, give it another two or three minutes and check again.

It is worth checking your thermometer now and then. The USDA describes a simple test: stir ice cubes and water in a large glass, hold the stem at least 5 cm deep without touching the sides, wait at least 30 seconds, and it should read 0 °C (32 °F)⁵.

Small tricks that help

• Bring dense leftovers out of the fridge while the air fryer warms up. A few minutes only; not hours.
• Add a little fat to dry food. A few drops of oil on roast potatoes or a brush of oil on pastry brings back the shine.
• Cover delicate tops. A small piece of foil, weighed down by the food so the fan cannot lift it, stops cheese or pastry from over-browning while the centre heats.
• Cut large pieces smaller. A thick chicken breast reheats far more evenly sliced.
• Keep the basket clean. Old fat smokes when reheated and flavours the food. Wash coated baskets gently with a soft sponge.

The short version

Use the air fryer for anything that was crisp the first time, at a moderate 160 to 180 °C, in a single layer, until steaming hot in the middle. Use a pan or the microwave for wet dishes. Chill leftovers within two hours, eat them within three or four days, and treat rice with extra care. For more on cooking from scratch in the same machine, see our guide to what to cook in an air fryer.