Begin by preheating your oven to 375°F (190°C). This ensures that your mushrooms will roast evenly and turn golden brown.
Gently clean the baby Bella mushrooms with a damp cloth to remove any dirt. Carefully remove the stems, creating a hollow cavity for the stuffing. Set the mushroom caps aside and finely chop the stems, as they will be added to the filling.
In a mixing bowl, combine the Boursin cheese, chopped mushroom stems, and minced fresh parsley. Mix until well blended.
Using a spoon or small scoop, generously fill each mushroom cap with the Boursin cheese mixture. Don’t be shy; the more filling, the better!
In a separate bowl, mix the panko breadcrumbs with the melted salted butter. Stir until the breadcrumbs are evenly coated with the butter.
Sprinkle the buttery panko mixture over the filled mushroom caps, ensuring each one is well-covered. This topping will create a delightful crunch that balances the creamy filling.
Place the stuffed mushrooms on a baking sheet and pop them in the preheated oven. Bake for about 20-25 minutes, or until the mushrooms are tender and the topping is golden brown.
Once baked to perfection, remove the Boursin Stuffed Mushrooms from the oven. Let them cool for a minute before serving. Garnish with additional fresh parsley if desired, and watch them disappear!