Name: Boursin Stuffed Mushrooms
Ingredients: Cooking spray; 24 large button mushrooms, stemmed; 2 Tbsp. butter; ½ medium onion, finely chopped; 2 cloves garlic, minced; 1 Tbsp. finely chopped parsley, plus more for garnish; 1 (5.2 oz.) block Boursin cheese; ½ cup breadcrumbs, plus more for sprinkling; ½ cup grated Parmesan cheese; Kosher salt, to taste; Ground black pepper, to taste; Olive oil, for drizzling