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The Ultimate Comfort: Spinach, Mushroom & Potato Purée Casserole

This Spinach, Mushroom & Potato Purée Casserole is the ultimate comfort food, perfect for family dinners or special occasions. A creamy, hearty casserole made with sautéed mushrooms, fresh spinach, and smooth mashed potatoes, topped with a layer of savory Parmesan. It’s simple, nutritious, and utterly delicious—sure to satisfy your cravings for a cozy, flavorful meal.
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Prep Time 20 minutes
Cook Time 40 minutes
Total Time 1 hour
Servings: 6 -8 servings
Course: Main Dish
Cuisine: American
Ingredients Method Notes

Ingredients
  

  • 4 cups fresh spinach chopped
  • 4 medium potatoes peeled and diced
  • 1 ½ cups mushrooms sliced
  • 1 medium onion finely chopped
  • 3 cloves garlic minced
  • 2 tbsp olive oil
  • 1 cup heavy cream
  • ½ cup vegetable broth
  • 1 tsp salt
  • ½ tsp black pepper
  • ¼ tsp nutmeg
  • ½ cup Parmesan cheese grated
  • 2 tbsp butter
  • 2 tbsp fresh parsley chopped (for garnish)

Method
 

  1. Prepare the potatoes: Boil the diced potatoes in salted water until they are tender, about 12-15 minutes. Drain and set aside.
  2. Sauté the vegetables: In a large skillet, heat olive oil over medium heat. Add the onions and garlic, cooking until softened, about 4 minutes. Add the sliced mushrooms and cook until golden, about 5 minutes. Stir in the spinach and cook until wilted, 2-3 minutes. Season with salt, pepper, and nutmeg.
  3. Mash the potatoes: In a large bowl, mash the boiled potatoes with the heavy cream and vegetable broth until smooth. Stir in the butter and Parmesan cheese.
  4. Combine and bake: Gently mix the sautéed vegetables into the mashed potatoes. Transfer the mixture to a greased casserole dish, spreading it evenly. Top with more Parmesan cheese and bake at 375°F (190°C) for 20-25 minutes, until the top is golden and bubbly.
  5. Garnish and serve: Sprinkle fresh parsley on top for added color and flavor before serving.

Notes

  • Make-Ahead: You can prepare the casserole the day before, cover it, and refrigerate it. Simply bake it when you’re ready to serve.
  • Customizations: Feel free to add more vegetables like leeks, carrots, or cauliflower for additional flavor and texture. For a dairy-free version, swap the cream and butter for coconut cream and olive oil.
  • Freezing: This casserole freezes well! You can assemble it, freeze it, and bake it from frozen, though baking may take a bit longer.