Prepare the Mushroom: Break the cauliflower mushroom into bite-sized pieces if not already done. Pat dry with a kitchen towel to remove excess moisture.

Heat the Pan: Heat the olive oil over medium heat in a large skillet. Add the butter if using, allowing it to melt and combine with the oil.

Sauté the Garlic: Add the minced garlic to the skillet and cook for 1 to 2 minutes until fragrant, stirring to avoid burning.

Cook the Mushrooms: Increase the heat to medium-high and add the cauliflower mushroom pieces. Sauté for 5 to 7 minutes, stirring occasionally, until the mushrooms are tender and lightly golden.

Season and Finish: Sprinkle the thyme, salt, and pepper over the mushrooms. Toss to coat evenly. For a fresher flavor, squeeze in some fresh lemon juice right before removing from the heat.

Garnish and Serve: Transfer the mushrooms to a serving plate and garnish with fresh parsley. Serve hot as a side dish or enjoy as a light meal with crusty bread.