One of my favorite sides to serve with prime rib is roasted vegetables! A mixture of carrots, potatoes, and parsnips roasted in a flavorful oil, such as olive oil or avocado oil, is a delicious and festive way to round out your meal. You can also add some herbs and spices to the mix, like rosemary, thyme, and garlic. If you want to take it up a notch, add some crispy bacon or pancetta to the vegetables for an extra layer of flavor.