Roasted Green Beans with Mushrooms, Balsamic, and Parmesan ~ 8 oz mushrooms, sliced in 1/2" slices, 1 lb fresh green beans, preferably thin French style beans, 1 1/2 TBsp olive oil, 1 TBsp balsamic vinegar, salt and fresh ground black pepper to taste, 2 TBsp finely grated parmesan cheese.