Preheat the oven to 350 degrees F.

Wipe the mushrooms with a clean, damp cloth and trim stems.

Slice the mushrooms into pieces no larger than 2 inches in size.

In a large bowl, whisk together the olive oil, salt, pepper, garlic and herbs.

Add in mushrooms and toss together to evenly coat.

Evenly spread the mushrooms on a medium baking sheet or ovenproof casserole dish large enough to fit all of the mushrooms.

Bake for about 30 to 40 minutes, or until cooked through.

Remove mushrooms from the oven about halfway through and flip them a few times, then return sheet to oven.

Remove from the heat, and drizzle with the balsamic vinegar.