Layered Mashed Potato & Mushroom Casserole
From EatingWell: November/December 2009
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.
- 3 1/2 pounds potatoes, preferably Yukon Gold, peeled and cut into 1-inch pieces
- 1 1/2 pounds cremini or white mushrooms, halved
- 1 tablespoon butter
- 1/2 cup nonfat buttermilk
- 1 large egg plus 1 large egg white, beaten
- 1 1/4 teaspoons salt, divided
- 1 tablespoon extra-virgin olive oil
- 3/4 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
- 1/2 teaspoon freshly ground pepper
- 1/2 teaspoon chopped fresh rosemary
- 1 cup freshly grated Parmesan cheese, divided
- Bring 1 inch of water to a simmer in a large pot. Place potatoes in a steamer basket, cover and steam over medium-low heat, replenishing the water as necessary, until the potatoes are fall-apart tender, 20 to 30 minutes.
- Meanwhile, working in two batches, place mushrooms in a food processor and pulse, stopping to scrape down the sides as needed, until the mushrooms are coarsely chopped.
- Transfer the potatoes to a large bowl. Add butter and mash until chunky-smooth. Gradually stir in buttermilk, egg and egg white and 1 teaspoon salt. Set aside.
- Heat oil in a large skillet over medium heat. Add shallots and garlic and cook, stirring, until fragrant and beginning to soften, about 1 minute. Add the mushrooms and cook, stirring often, until they release their liquid and the pan is almost dry, 10 to 12 minutes. Add chard (or spinach) and continue to cook, stirring, until wilted, about 4 minutes. Whisk broth and flour in a small bowl. Add to the pan along with the remaining 1/4 teaspoon salt, pepper and rosemary. Cook, stirring, until the mixture bubbles and thickens, about 1 minute.
- Preheat oven to 400°F.
- To assemble, spread half of the mashed potatoes in an even layer in a 9-by-13-inch (or similar 3-quart) baking dish. Sprinkle half the Parmesan over the potatoes. Spread the mushroom mixture on top and spread the remaining potatoes over the mushroom layer. Top with the remaining Parmesan.
- Bake until hot throughout and the top is golden brown, about 35 minutes.
Tips & Notes
- Make Ahead Tip: Assemble through Step 6, cover and refrigerate for up to 1 day. Bake, uncovered, in a 400°F oven until hot, 50 minutes to 1 hour. To reheat, bake, covered, at 350° until hot, 40 to 50 minutes.
196 calories; 5 g fat (2 g sat, 2 g mono); 26 mg cholesterol; 32 g carbohydrates; 8 g protein; 3 g fiber; 438 mg sodium; 773 mg potassium.
Carbohydrate Servings: 2
Exchanges: 2 starch, 1 fat
Nutrition Note: Potassium (22% daily value), Vitamin A & Vitamin C (20% dv).
More From EatingWell
Fresh, sun-ripened tomatoes not only taste wonderful, they...
Add these healthy and delicious recipes to your gluten-free...
When summer tomatoes from backyard gardens and farmstands hit...
When the produce section looks bleak, turn to the freezer....
If you’re craving an easy dessert tonight, we have just what...
The Meatless Monday movement is growing in popularity across...
Potassium plays a vital role in keeping your heart healthy...
Go beyond the gin and tonic this summer and mix up cocktails...
In the hot months of summer, cool down with a refreshing and...
Our nonalcoholic drink recipes, or “mocktails,” are festive...
Kick back and enjoy one of our delicious healthy summer punch...
During the busy workweek, these no-cook dinner recipes are...
Quinoa is a superfood that is packed with fiber and protein...
Fresh leeks are a delicious addition to many recipes. These...
Farmers’ markets and gardens are full of fresh and delicious...
Sardines (Pacific, wild-caught) are one of the healthiest...
- Ease of Preparation
- November/December 2009