Layered Mashed Potato and Mushroom Casserole Recipe

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Layered Mashed Potato and Mushroom Casserole
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  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. Preheat oven to 400°F.
  6. 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.
  7. Bake until hot throughout and the top is golden brown, about 35 minutes.
  8. MAKE AHEAD INSTRUCTIONS: 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.
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Nutrition Facts

Per ServingPer 100 g
Amount Per 1 Serving
Calories 222.52 Kcal (932 kJ)
Calories from fat 59.22 Kcal
% Daily Value*
Total Fat 6.58g 10%
Cholesterol 27.06mg 9%
Sodium 655.05mg 27%
Potassium 936.7mg 20%
Total Carbs 32.96g 11%
Sugars 3.12g 12%
Dietary Fiber 1.94g 8%
Protein 10.96g 22%
Vitamin C 28.6mg 48%
Iron 188.8mg 1049%
Calcium 224.1mg 22%
Amount Per 100 g
Calories 84.47 Kcal (354 kJ)
Calories from fat 22.48 Kcal
% Daily Value*
Total Fat 2.5g 10%
Cholesterol 10.27mg 9%
Sodium 248.65mg 27%
Potassium 355.56mg 20%
Total Carbs 12.51g 11%
Sugars 1.18g 12%
Dietary Fiber 0.74g 8%
Protein 4.16g 22%
Vitamin C 10.9mg 48%
Iron 71.7mg 1049%
Calcium 85.1mg 22%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.


  • salty
  • savory
  • bitter
  • sweet
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Recipe Tags

Weightwatchers Points

  • 4.6
  • 6

Good Points

  • low fat,
  • saturated fat free,
  • low cholesterol

Bad Points

  • High in Sodium

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