Layered Mashed Potato & Mushroom Casserole
"Fancy up regular mashed potatoes with a layer of mushroom duxelle—a sauté of finely chopped mushrooms and shallots. We omitted the traditional butter in the duxelle and added chard for a nutritional boost. Serve this hearty side in place of mashed potatoes at any holiday feast or enjoy it as a vegetarian main dish...."
INGREDIENTS
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3 1/2 pounds potatoes, preferably Yukon Gold, peeled and cut into 1-inch pieces
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1 1/2 pounds cremini or white mushrooms, halved
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1 tablespoon butter
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1/2 cup nonfat buttermilk
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1 large egg plus 1 large egg white, beaten
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1 1/4 teaspoons salt, divided
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1 tablespoon extra-virgin olive oil
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3/4 cup chopped shallots
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3 cloves garlic, finely chopped
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4 cups trimmed and finely chopped chard, or spinach
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1 cup mushroom broth, or reduced-sodium beef broth
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2 tablespoons all-purpose flour
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1/2 teaspoon freshly ground pepper
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1/2 teaspoon chopped fresh rosemary
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1 cup freshly grated Parmesan cheese, divided
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