Preheat oven to 400 degrees. Line a baking sheet with parchment paper and set aside.
In a large bowl, combine mushrooms. olive oil, garlic, vinegar, and salt. Toss well to coat the mushrooms in the oil. Spread in an even layer on the prepared baking sheet. Bake for about 30 minutes, turning halfway through.
Remove from the oven and sprinkle fresh parsley on top. Serve and enjoy.