The setup is simple. Veggies, olive oil, garlic, spices. I roasted some root veggies for Christmas (sorry no pics) and followed the same system (carrots, sweet potatoes, parsnips, turnips, garlic, olive oil, sage).
For this preparation I took fresh green beans with both ends chopped off, fresh scallions cut to the same length as the green beans, a couple tablespoons of minced garlic, fresh sage (~30 whole leaves), dried thyme (~2 tsp), and dried rosemary (~2 tsp). I drizzled with olive oil (probably about 2 - 3 tbsp) and mixed until everything was lightly covered.
And that's it! Once done you have some nice caramelization on parts of the beans, a good balance between crisp and "soggy" bites, and a good foundation for any of the gravies or sauces you'll be serving with your entree rather than coming to the party with its own sauce.