Preheat your oven to 400°F (200°C). Gather all your ingredients.

In a large mixing bowl, combine cleaned mushrooms with olive oil, salt, and pepper. Toss to coat.

Spread seasoned mushrooms on a baking sheet in a single layer. Roast for approximately 20 minutes, stirring halfway.

Melt butter in a skillet over medium heat until foamy and hazelnut brown, about 5-7 minutes.

Remove from heat and stir in minced garlic and thyme, then add lemon juice.

Toss roasted mushrooms in the skillet with the browned butter sauce and adjust seasoning to taste.