Rinse mushrooms to remove any dirt and pat dry with a paper towel. Trim any extra long mushroom stems.

Add butter and olive oil to a large pan over medium-high heat. Let heat until butter is melted.

Add mushrooms and sprinkle with salt and pepper.

Let mushrooms cook for 5-7 minutes, stirring infrequently to allow mushrooms to brown and caramelize.

Reduce heat to medium and add garlic, thyme, and parsley. Cook for 1-2 minutes, until fragrant.

Toss everything well in the pan, then add to a serving dish, making sure to pour remaining pan drippings over top.

Sprinkle with remaining parsley for garnish and serve warm.