Wash all the vegetables (sweet potatoes, beetroot, zucchini and broccoli), and peel as preferred. The sweet potatoes and beetroot don't need to be peeled, but I prefer doing so.
Cut the sweet potato and beetroot into 2 cm chunks. Cut the zucchini in half, and cut in 2 cm half rounds. Take out the seeds of the red capsicum / bell pepper and cut into 2 cm chunks. It’s important to cut all similar vegetable the same size so they cook evenly.
Preheat oven to 400°F / 200°C (180°C fan-forced) and prepare 1-2 large baking sheets (depending on how many vegetables you’re roasting) with parchment paper or a non-stick silicon baking sheet.
Add vegetables to the baking trays depending on their total cook time. The root vegetables (sweet potato and beetroot) will take take longer (around 30 - 40 minutes) and should be on the same baking tray. The zucchini and red bell pepper / capsicum will take less time, so they can be on the same tray. Cruciferous vegetables like broccoli or cauliflower take less time, and so should be placed on the same tray.
Drizzle the vegetables with olive oil and season with salt and black pepper. Additional flavourings of choice can be added at this stage. Toss the vegetables to make sure they are coated with the oil, and seasonings. This can be done in a bowl prior to putting them on the baking tray, or on the baking tray itself.
Roast in the oven till the vegetables are roasted and charred on the edges from the outside and soft from inside. Halfway through the baking process, toss the veggies around. This will ensure that they cook on all sides. Roasting time will differ depending on the vegetables – the zucchini and red bell pepper / capsicum will take about 20 – 25 minutes, whereas the sweet potatoes and beetroot will take about 30 - 40 minutes. To check if the root vegetables are done, just pierce with a fork. If it pierces through they are cooked.
Eat the roasted vegetables right away or serve them with your favourite protein. Leftovers can be kept in the fridge in an airtight container for around 4 – 5 days. To reheat, place them in a preheated oven at 400°F / 200°C (180°C fan-forceuntil hot or use an air fryer, or you can reheat them on a stovetop.
Leftover roasted vegetables can also be frozen but their texture will be on the soft side once frozen, so they would best be used in recipes such as soups, smoothies or dips.