Asparagus Bell peppers Green beans Mushrooms Summer squash Tomatoes Zucchini About 20 to 30 minutes Cauliflower Broccoli Fennel Garliccloves Onions Snap peas Turnips 30 minutes or longer Beets Brussels sprouts Carrots Parsnips Potatoes Pumpkin Sweet potatoes Common rules of roasting Use a good pan. If ...