Step 1

Preheat oven to 425 degrees, and line a baking sheet (with a rim) with aluminum foil. Alternatively, spray a baking dish with non-stick cooking spray.

Step 2

Wipe mushrooms with a damp paper towel and trim any long stems. If mushrooms are large, cut in half, or quarter if they're huge.

Step 3

Add oil, vinegar, garlic, thyme, salt and pepper to a mixing bowl and whisk until well combined. Add mushrooms and toss to ensure mushrooms are coated. Spread out on baking sheet (or baking dish) and scatter butter throughout mushrooms.

Step 4

Bake for 20-25 minutes, giving the pan a shake (or stirring the mushrooms) about halfway through.

Step 5

If desired, sprinkle with fresh minced parsley before serving.