01 - preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
02 - gently clean the mushrooms using a damp paper towel, remove the stems, and set the caps aside. finely chop the removed stems.
03 - heat 1 teaspoon of olive oil in a small skillet over medium heat. sauté the chopped mushroom stems and minced garlic for 2–3 minutes until softened. allow to cool slightly.
04 - in a mixing bowl, combine the softened cream cheese, grated Parmesan, shredded mozzarella, sautéed stems and garlic mixture, chopped parsley, chopped chives, salt, and black pepper. stir until the mixture is smooth and well combined.
05 - generously spoon or pipe the cheese mixture into each prepared mushroom cap.
06 - place the filled mushroom caps onto the prepared baking sheet. drizzle them with the remaining olive oil and sprinkle with the additional grated Parmesan cheese.
07 - bake the stuffed mushroom caps for 18–20 minutes, or until the mushrooms are tender and the filling is golden and bubbly.
08 - allow the mushroom caps to cool for 5 minutes before serving.