Roasted Vegetables with Green Beans, Onions, Mushrooms and Carrots. This recipe for Roasted Vegetables with Green Beans, Onions, Mushrooms, and Carrots is a delicious and healthy side dish that is ideal for any occasion. Roasting vegetables brings out their natural sweetness and flavors them up. It's also a great way to get your daily dose of vegetables. #black pepper, #carrots, #mushrooms, #onions, #salt, #green beans