Oven-roasted vegetables with garlic and thyme

The best temperature for roasting vegetables in the oven is around 200C, 180C fan, or gas mark 6. This gives the vegetables crisp, golden edges with a slight caramelisation, while the inside becomes tender. Soft vegetables like tomatoes will cook faster, while root vegetables such as sweet potatoes cook more slowly, so adjust the oven temperature accordingly or add certain vegetables later. For best results, spread the vegetables out in a single layer on a baking tray to allow the heat to circulate properly. This prevents them from steaming and helps create a delicious roasted texture.

The best vegetables for roasting are root vegetables like potatoes and carrots, cruciferous veggies like broccoli and cauliflower, and low-moisture vegetables such as onions and butternut squash. These vegetables hold up well to high heat, which helps them caramelise and become golden and crisp on the outside while turning soft and flavourful inside. Cut the vegetables into even-sized pieces, give them enough space on the tray, and coat them lightly in oil or melted butter. Roast them in the oven at around 200C, 180C fan, or gas mark 6.

Cut the vegetables into even-sized pieces so they roast evenly and cook at the same pace. This also prevents some pieces from burning while others are still underdone. Break cruciferous vegetables such as cauliflower and broccoli into large florets; not too small, or they will cook too fast and go dry. For vegetables like red onions, cut them into thick wedges so they soften and sweeten in the oven without falling apart. And if you are roasting whole garlic bulbs, just slice them in half across the middle. Root vegetables like carrots, parsnips, and sweet potatoes work well in chunky batons or 2–3cm cubes.

Oven-roasted vegetables are done when they have a deep golden-brown colour around the edges, which shows they have caramelised. The insides should be tender enough to pierce easily with a fork, but not mushy. Different vegetables roast at slightly different rates. Cruciferous vegetables like broccoli and cauliflower cook faster and crisp up sooner. Keep an eye on them during the last 10 minutes; they are likely ready when they are starting to look browned and a little crisp at the edges. Specifically, the butternut squash should be golden on one side, and the cauliflower, broccoli, and red onions should have browned or slightly charred tips. The garlic should be soft when pressed. If in doubt, taste one.

Your oven-roasted vegetables are most likely soggy because they have been too crowded on the tray or cooked at too low a temperature. When vegetables are packed too tightly, they trap steam instead of allowing it to escape, so instead of roasting, they end up steaming in their own moisture. To fix it, make sure you spread the vegetables out in a single layer with a bit of breathing room between each piece. If your tray feels crowded, split the batch across two trays. Roast at a high temperature, around 200C, 180C fan, or gas mark 6, so the moisture evaporates quickly and the vegetables can caramelise properly. Also, keep the oil or butter to a minimum, use just enough to coat and skip the parchment paper if you are after extra crisp edges. A hot, bare tray gives better browning and helps keep things from going soggy.

Yes, you can use frozen vegetables instead of fresh in your oven-roasted vegetables recipe. Keep in mind that frozen vegetables are usually softer and contain more moisture, which might affect how crispy they become. For best results, roast them straight from the freezer, spread them out in a single layer so that they cook evenly, and possibly raise the oven temperature to reduce moisture. Check if they are done after 15–20 minutes. Before roasting, toss the vegetables in melted butter and thyme to distribute the flavour evenly. Although the texture might be softer, the vegetables will still be tasty.