Air Fryer Onions

Ingredients

• 4–5onions, halved and thinly sliced
• to tastecooking oil or olive oil spray

Instructions

1. 1

   Preheat the air fryer

   Preheat the air fryer to 130 °C for 5 minutes.

2. 2

   Coat the onions

   Lightly spray the air fryer basket with oil. Add the sliced onions, spray them gently with oil and toss to coat evenly.

3. 3

   Cook until crisp

   Air-fry the onions for 25–30 minutes in total. Set a timer for every 5 minutes to shake the basket and toss the onions. They are ready when golden brown and crispy.

4. 4

   Cool and store

   Let the onions cool completely before storing them in an airtight jar in the fridge for up to one month.

What are air fryer onions?

Air fryer onions are thinly sliced onions cooked with a light coating of oil until browned and crisp. They make a crunchy garnish for dishes such as burgers, salads and baked potatoes.

Crispy fried onions are a familiar American-style topping, often used to add savoury crunch to casseroles and other comfort foods. This version uses an air fryer and a low temperature for a gradual cook.

Nutrition and macros by portion

The nutrition label shows one serving as written: 38 calories, 0g protein, 0g carbs, 0g fat.

The onions provide most of the carbohydrates, while the cooking oil contributes the fat; there is little protein in this topping. Pair a measured portion with a protein-rich main and vegetables to make a more complete plate.

Choosing and slicing the onions

Onion choice: Yellow or brown onions give a classic savoury flavour, while white onions also work. Use onions of a similar size so the slices finish cooking at roughly the same time.

Even slices: Cut each onion in half, then slice it thinly. Consistent slices are easier to toss and are less likely to have some pieces turn crisp long before others.

Why the oil matters

Light coating: A small amount of cooking oil or olive oil spray helps the onion surfaces brown and crisp. Spray lightly, then toss well so the slices are coated rather than sitting in pools of oil.

Basket preparation: A quick spray on the basket helps reduce sticking. Keep the onions loose enough to shake and turn during cooking.

The slow air-frying stage

Low heat: The air fryer is preheated to 130 °C, then the onions cook for 25–30 minutes. This gives them time to lose moisture and develop colour without rushing the process.

Regular tossing: Shake the basket every 5 minutes and move the onions around. This repeated turning helps expose more of the slices to the circulating air.

How to tell when they are ready

Colour: Look for an even golden-brown appearance, checking the thinner pieces as you toss. The recipe’s doneness cue is golden colour with a crispy texture.

Cooling: Let the onions cool completely before putting them in a jar. They may continue to firm up as they cool, so avoid judging the final crunch straight from the hot basket.

Ways to serve them

For a topping: Scatter the onions over burgers, sandwiches, salads or baked potatoes just before serving to preserve their crunch.

For a savoury finish: Try them on soups, casseroles or roasted vegetables. Add them at the end rather than cooking them into a wet dish if you want the crisp texture to remain noticeable.

Recipe notes & tips

• Slice the onions evenly so they cook at a similar rate.
• Use a light, even spray of oil and toss the onions before cooking.
• Set a timer for each 5-minute interval so the onions are turned regularly.
• Check the colour as cooking nears the 25-minute mark, since air fryers can vary.
• Cool the onions fully before transferring them to an airtight jar.

Variations

• Use red onions: Slice them in the same way for a different colour and flavour.
• Add black pepper: Toss a little through the onions before air-frying.
• Try garlic powder: Add a light dusting before cooking for a savoury variation.
• Season with paprika: Coat the onions lightly before they go into the air fryer.
• Mix onion types: Combine yellow and red onion slices, keeping them similarly sized.

Common mistakes to avoid

• Uneven slices: Very thick and very thin pieces cook differently, so aim for consistent thin slices.
• Too much oil: Excess oil can leave the onions greasy; use a light spray and toss to distribute it.
• Skipping the shakes: Onions left untouched may cook unevenly; shake and toss every 5 minutes.
• Crowding the basket: A packed basket is harder to toss evenly, so cook in batches if needed.
• Sealing while warm: Trapped warmth can affect the texture; wait until the onions are completely cool.

How to store

Once completely cool, store the onions in an airtight jar in the fridge for up to one month, as directed in the recipe. The method does not specify reheating; use them cold as a topping or warm them briefly in the air fryer if desired.

Frequently asked questions