One tray, 210 °C, no crowding — vegetables packed together steam and go grey rather than colouring. Better an hour later than straight from the oven, which is the only dish here that is improved by being forgotten about.
The method above is what decides the dish, not a step-by-step recipe. The link runs a web search on the name: this page has no vetted sources of its own, and will not invent any.