Root vegetables like potatoes, sweet potatoes, butternut squash, turnips, rutabagas, and carrots are all great for roasting. Other delicious veggies to roast include eggplant, brussel sprouts, red onion, mushrooms, bell peppers, and cauliflower. Broccoli, zucchini, and summer squash are all great for roasting as well, although they don't typically take as long to cook as root vegetables.