Best Boursin-Stuffed Mushrooms Recipe - How To Make Boursin-Stuffed Mushrooms

Ingredients

• 2 tbsp. unsalted butter
• 20 button mushrooms, stems chopped, caps reserved
• 1/2 yellow onion, finely chopped
• 2 cloves garlic, minced
• 1 tbsp. finely chopped fresh parsley, plus more for sprinkling
• 1 (5.2-oz.) block Boursin
• 1/2 c. plain breadcrumbs, plus more for sprinkling
• 1/2 c. grated Parmesan
• Kosher salt
• Freshly ground black pepper
• Extra-virgin olive oil, for drizzling