Roast vegetables are the part of a Sunday lunch or Christmas dinner that quietly takes up the most oven space. Parsnips, carrots, sprouts and squash all want a hot oven and plenty of room, at exactly the moment the meat needs to rest and the potatoes need a final blast. An air fryer oven takes a lot of that pressure off, and gives you crisp, caramelised edges in less time than a full-size oven usually needs.
This guide covers how to cut each vegetable, how much oil to use, the timings that work at 200°C and how to add a honey glaze without burning it. The timings are based on a 30L air fryer oven such as the Fridja f77 Super Oven Pro, but the same principles apply to any countertop air fryer oven. If you are new to yours, our guide on how to use an air fryer oven explains the settings first.
Why roast vegetables in an air fryer oven?
The big advantage is airflow. A fan pushes hot air across the surface of every piece, which dries the outside quickly so it browns rather than steams.
The f77 has six stainless steel heating elements and a turbo convection fan, so it cooks from the top and bottom at once, and its 30L capacity fits a full tray of veg for a family. If you usually cook for one or two, the 15L f66 Super Oven handles a smaller tray well. You can compare both in our digital air fryer ovens range.
On a busy cooking day there is a practical bonus too. Roasting the veg in the air fryer oven frees your main oven for the meat, the stuffing or a tray of pigs in blankets.
Cut sizes: the most important step
Most uneven results come down to uneven cutting. Pieces of the same size cook at the same rate.
- Parsnips: quarter lengthways, then cut into batons about 1.5cm thick. Cut out the woody core from large, older parsnips.
- Carrots: cut lengthways into batons about 1.5cm thick, or into 2cm chunks on the diagonal.
- Brussels sprouts: trim the base and halve them. Halved sprouts brown on the cut face and cook through evenly.
- Butternut squash: peel if you prefer (the skin softens and is edible), then cut into 2.5cm cubes.
- Red onions: cut into six or eight wedges, keeping the root on so the layers hold together.
- Beetroot: peel and cut into 2cm wedges. Beetroot is dense, so smaller pieces help.
- Peppers and courgettes: cut into 3cm pieces. They hold more water, so give them extra space.
- Broccoli and cauliflower: cut into small florets of a similar size.
Oil, seasoning and spacing
You need much less oil than for a conventional roast, but a little is still important. Oil helps the heat get into the surface and stops the veg drying out. As a guide, use about 1 tablespoon of oil for every 500g of vegetables. Toss everything in a bowl rather than drizzling it on the tray, so every piece gets a thin, even coat.
Olive, rapeseed and sunflower oil all work well. Season with salt and pepper before cooking and add dried herbs such as thyme or rosemary at the same time. Save fresh, soft herbs like parsley for the end.
Spacing matters more than anything else. Spread the veg in a single layer on the baking tray or in the air fry basket, with a little gap between pieces. Piled-up veg steams and stays pale. For a big batch, use two shelves and swap them halfway, or cook in two rounds and keep the first warm.
Roast vegetable timings at 200°C
Preheat the oven to 200°C first. These timings are a starting point for single-layer trays, so check a few minutes early the first time, as every load is a little different. Turn or shake the veg halfway through.
- Parsnips (batons): 20 to 25 minutes
- Carrots (batons or chunks): 20 to 25 minutes
- Brussels sprouts (halved): 15 to 18 minutes
- Butternut squash (2.5cm cubes): 20 to 25 minutes
- Red onion (wedges): 15 to 20 minutes
- Beetroot (2cm wedges): 30 to 35 minutes
- Peppers and courgettes: 12 to 15 minutes
- Broccoli and cauliflower florets: 10 to 12 minutes
The vegetables are ready when a knife slides in easily and the edges are browned. If they are tender but pale, give them another 3 to 5 minutes. If the edges are catching before the middle is soft, lower the temperature to 180°C and add a few minutes.
Mixing vegetables on one tray
You can roast a mixed tray, but add the vegetables in stages so everything finishes together. Start with the slowest and add the quicker ones later. For a classic winter mix:
- Put the beetroot in first and roast for 10 minutes.
- Add the parsnips, carrots and squash, then roast for another 10 minutes.
- Add the sprouts and red onion, turn everything and roast for a final 12 to 15 minutes.
How to add a honey glaze without burning it
Honey-roasted parsnips and carrots are a Christmas favourite, but honey burns quickly at high heat. The trick is to add it at the end.
- Roast the parsnips and carrots as normal until they are tender and starting to brown, usually about 18 minutes.
- Mix 1 tablespoon of honey or maple syrup per 500g of veg with a teaspoon of wholegrain mustard and a few thyme leaves.
- Toss the hot veg in the glaze on the tray and return it for 4 to 5 minutes, until sticky and glossy.
The interior light on the f77 lets you check the glaze without opening the door and losing heat.
Fitting roast veg into a bigger meal
On Christmas Day or for a Sunday roast, the air fryer oven works best as a second oven. A simple plan looks like this:
- Cook the meat in your main oven, then let it rest under foil for 20 to 30 minutes.
- Start the potatoes in the air fryer oven first, as they take longest. Our guide to crispy roast potatoes in an air fryer oven has the method.
- Roast the veg on a second shelf or straight after, while the meat rests and the gravy is made.
Having a spare f77 baking tray helps here, as one batch can be prepped and oiled while the other cooks.
Preparing ahead and reheating
You can peel and cut root veg the day before and keep them in a sealed container in the fridge. Dry them well with a clean tea towel before oiling, because wet veg will steam rather than brown.
Leftover roast veg reheat well. Spread them out on the tray and warm them at 180°C for 5 to 8 minutes, until piping hot all the way through. There are more ideas in our guide to reheating leftovers in an air fryer oven.
Cleaning up afterwards
A honey glaze can stick, so let the tray cool and then soak it in warm water with a little washing-up liquid before scrubbing. On the f77, the baking tray, grill rack and air fry basket are dishwasher safe on the top rack at up to 40°C, while the crumb tray should be washed by hand. Our air fryer oven cleaning guide covers the racks, trays and glass door in more detail.
Frequently asked questions
Do you need to preheat an air fryer oven for roast vegetables?
Yes, it helps. Putting vegetables into a hot oven starts the browning straight away, so the outside crisps before the inside turns soft and watery. A countertop air fryer oven only takes a few minutes to reach 200°C, so preheat it while you cut and oil the veg and you lose very little time.
What temperature should you roast vegetables at in an air fryer?
200°C suits most roast vegetables, including parsnips, carrots, sprouts and squash. Very dense pieces such as beetroot also do well at 200°C but need longer. If the edges start to burn before the middle is tender, drop to 180°C and add a few minutes. Quick-cooking veg such as broccoli is fine at 200°C for a short time.
Why are my air fryer roast vegetables soggy?
Soggy veg is usually caused by overcrowding, too much moisture or too low a temperature. Spread the pieces in a single layer with gaps between them, dry the veg well after washing and preheat the oven to 200°C. Peppers and courgettes hold a lot of water, so give them extra space or cook them on a separate tray.
Can you roast frozen vegetables in an air fryer oven?
Yes. Cook them straight from frozen rather than thawing them first, as thawed veg goes limp. Toss in a little oil, spread them out in a single layer and roast at 200°C for around 15 to 20 minutes, shaking halfway. Frozen veg releases water as it heats, so space matters even more than with fresh.