Preheat the oven to 180°C.
Cut the red onion into wedges, the sprouts, parsnips and baby carrots in half or 4 long wedges.
Scatter them into a baking dish together with the minced garlic. Add the chilli slices, if used.
Drizzle with some oil and scatter the herbs and lardons over them. Bake for about 15 minutes. You can now cool it for later use or continue with the recipe.
Add the olives and cheese, the bake or grill for another couple of minutes, until the vegetables are tender (warmed-through, if reheated) and the cheese has melted.