Preheat oven to 200°C (400°F).
Wash and chop all vegetables into bite-sized pieces.
In a large bowl, toss the vegetables with olive oil, cumin, chilli flakes, salt, and black pepper.
Spread evenly on a baking tray lined with parchment paper.
Roast for 25–30 minutes, stirring halfway, until golden and crisp on the edges.
Serve hot as a side dish or store in an airtight container for up to 3 days.