Step 1

Preheat oven to 400°F.

Step 2

In a large bowl, toss mushrooms with oil, balsamic vinegar (if using), and pepper. Spread on a rimmed baking sheet in a single layer.

Step 3

Bake for 10 minutes, toss with a spatula or spoon, and bake for 5-10 minutes more or until mushrooms are tender and golden brown. Sprinkle with salt and thyme, and serve warm or at room temperature.