Step 1

Preheat oven to 450 degrees F.

Step 2

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.