These super-flavorful mushrooms get a hint of sweetness thanks to a splash of balsamic vinegar. Parmesan cheese added at the end lends a savory note. Enjoy them as an accompaniment to steak or on their own as a side dish.
Preheat oven to 450 degrees F.
Stir oil, marjoram, pepper and salt together in a large bowl. Add mushrooms and toss to coat. Transfer to a large rimmed baking sheet. Roast for 12 minutes. Remove from the oven and drizzle with vinegar. Sprinkle with Parmesan and continue roasting until the cheese is melted, about 5 more minutes.