This recipe for Roasted Green Beans and Mushroms from Picklee is really simple, but a great way to prepare vegetables. You take fresh green beans and sliced mushrooms, toss them with some olive oil and balsamic vinegar, and put them in the oven. When they’re done, add some freshly grated Parmesan and serve. This could be a side dish, but they are so good you might be tempted to make them your main dish!