Layered Mashed Potato Mushroom Casserole

Ingredients

• 3 ½ pounds potatoes, preferably Yukon Gold, peeled and cut into 1-inch pieces
• 1 ½ pounds cremini or white mushrooms, halved
• 1 tablespoon butter
• ½ cup nonfat buttermilk
• 1 large egg plus 1 large egg white, beaten
• 1 ¼ teaspoons salt, divided
• 1 tablespoon extra-virgin olive oil
• ¾ cup chopped shallots
• 3 cloves garlic, finely chopped
• 4 cups trimmed and finely chopped chard or spinach
• 1 cup mushroom broth or reduced-sodium beef broth
• 2 tablespoons all-purpose flour
• ½ teaspoon freshly ground pepper
• ½ teaspoon chopped fresh rosemary
• 1 cup freshly grated Parmesan cheese, divided

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