I find that doing your veggies on a baking stone gives then a rich mellow flavor. The number of veggies you do, of course, depends on how many servings you need. I manage to fit all these veggies on a 15" stone to do two servings. Sweet potato wedges are wonderful but only need about 20 minutes. The mushrooms are heavenly and are done when they start to sweat. I would not recommend doing broccoli, cauliflower or marinated veggies on the stone, however you can add a sprinkle of something or dry spice combos. It is great preparing your veggies in advance and just have your final cooking step left to do and all on one stone.