Unstuffed Mushroom Casserole | Recipe Saver

Ingredients

• 6 tablespoons olive oil, divided
• 3 pounds medium white button mushrooms, quartered, divided
• 1 teaspoon kosher salt, divided, plus more, to taste
• freshly ground black pepper, to taste
• 6 cloves garlic, finely chopped, divided
• 1 (8-ounce) package cream cheese, cut into pieces
• 2 cups panko-style breadcrumbs, divided
• 1 cup Gruyère cheese grated
• 1 cup parmesan cheese, grated, divided
• 1/2 cup fresh parsley, chopped, plus more, optional, whole sprigs, to taste, for garnish
• 4 tablespoons unsalted butter, melted