The solution: Cut veggies about ½ inch thick. Items that stay whole, like baby carrots, can be your benchmark there. Preheat the oven to between 400° and 450° with a heavy roasting pan inside; the hot pan will jump-start the browning process. Spread oil-coated veggies in the hot pan in a single layer; don't crowd them, because that leads to steaming. Stir after 15 minutes to promote even browning and prevent sticking. Check after another 10 minutes, and then pull when gorgeously browned and fork-tender. If they're well browned but still tough, sprinkle with a couple of tablespoons of water, reduce heat to 350°, and cook until tender.