Spinach-Mushroom Quiche with Potato Crust

The first time I tasted a quiche, I was backpacking through the French countryside. It was at a tiny, family-run boulangerie, and the aroma of freshly baked bread mingled with the earthy scent of mushrooms. This wasn’t just any quiche; it was a spinach and mushroom masterpiece, the creamy filling nestled in a buttery, flaky crust. With each bite, I was transported to a world of simple, rustic flavors, a moment I’ve tried to recreate in my kitchen ever since. This recipe, with its clever potato crust, is my healthy take on that unforgettable experience.

Recipe Overview

• Prep Time: 30 minutes
• Cook Time: 45 minutes
• Total Time: 1 hour 15 minutes
• Servings: 6
• Yield: 1 pie
• Dietary Type: Vegetarian

Ingredients

• 2 tablespoons extra virgin olive oil
• 1 teaspoon extra virgin olive oil
• 4 Yukon gold potatoes (about 12 ounces)
• ½ cup onion, finely chopped
• 1 tablespoon cornstarch
• Salt and pepper
• 2 (5 ounce) containers baby spinach
• 8 ounces mushrooms, sliced
• 3 ounces Swiss cheese, shredded
• 2 large eggs
• 2 large egg whites
• ⅔ cup milk

Equipment Needed

• Food processor with shredding attachment
• Large bowl
• Large skillet
• 9-inch glass pie dish
• Whisk

Instructions

1. Preheat your oven to 400°F (200°C).
2. Grease a 9-inch glass pie dish with 1 teaspoon of olive oil. Ensure you coat the entire surface to prevent sticking.
3. Using a food processor fitted with the shredding attachment, shred the potatoes. If you don’t have a food processor, you can use a box grater, but the food processor will save considerable time.
4. Transfer the shredded potatoes to a large bowl and stir in the ½ cup of finely chopped onion, 1 tablespoon of cornstarch, ½ teaspoon of salt, and ¼ teaspoon of pepper. Mix thoroughly to ensure the cornstarch is evenly distributed; this helps bind the potato crust.
5. In a large skillet, heat 1 tablespoon of olive oil over medium heat. Make sure the skillet is large enough to accommodate the entire potato mixture.
6. Add the potato mixture to the skillet, flattening it into a 10-inch layer. Press down firmly to create a cohesive base.
7. Cook the potato mixture until the bottom is golden brown, about 10 minutes. Monitor the heat carefully to prevent burning; lower the heat slightly if necessary.
8. Loosen the potato layer with a spatula, then carefully invert it onto the prepared pie dish.
9. Mold the potato mixture into a crust, pressing it firmly against the bottom and sides of the pie dish.
10. Bake the potato crust for about 20 minutes, or until it’s lightly golden and set.
11. While the crust is baking, prepare the filling. Preheat the same skillet over high heat.
12. Add the baby spinach and ¼ cup of water to the skillet.
13. Cook, stirring, until the spinach is wilted, then drain the spinach thoroughly.
14. Squeeze out any excess water from the spinach. This is crucial to prevent a soggy quiche. Chop the spinach coarsely.
15. In the same skillet, heat the remaining 1 tablespoon of olive oil over medium heat.
16. Add the sliced mushrooms and cook, stirring occasionally, until browned, about 6 minutes. The mushrooms should release their moisture and then reabsorb it, resulting in a rich, savory flavor.
17. Add the chopped spinach to the mushrooms and season with salt to taste.
18. Spoon half of the spinach-mushroom mixture into the baked potato crust.
19. Sprinkle the shredded Swiss cheese evenly over the spinach-mushroom mixture.
20. Top with the remaining spinach-mushroom mixture.
21. In a bowl, whisk together the 2 large eggs, 2 large egg whites, ⅔ cup of milk, ¼ teaspoon of salt, and ¼ teaspoon of pepper. Whisk until well combined and slightly frothy.
22. Pour the egg mixture into the pie dish, ensuring it evenly distributes over the filling.
23. Bake the quiche until the filling is set, 20 to 25 minutes. The center should be firm to the touch and the edges lightly golden brown. A slight jiggle is okay, as it will continue to set as it cools.
24. Let the quiche cool for a few minutes before slicing and serving.

Expert Tips & Tricks

• Par-Bake the Crust: For an extra crispy crust, par-bake it with pie weights or dried beans for the first 15 minutes, then remove the weights and bake for the remaining 5 minutes.
• Prevent a Soggy Crust: To prevent a soggy crust, brush the par-baked potato crust with a thin layer of beaten egg white before adding the filling.
• Mushroom Flavor Boost: Add a splash of soy sauce or Worcestershire sauce to the mushrooms while they are cooking for a deeper umami flavor.
• Cheese Variety: Feel free to experiment with different cheeses! Gruyere, cheddar, or even a bit of crumbled goat cheese would all be delicious additions.
• Make-Ahead Magic: The potato crust can be made a day ahead. Store it, covered, in the refrigerator until ready to fill and bake.

Serving & Storage Suggestions

This Spinach-Mushroom Quiche is delicious served warm or at room temperature. Garnish with a sprinkle of fresh parsley or chives for a pop of color. Serve it as a light lunch, brunch, or dinner.

Storage: Leftovers can be stored in the refrigerator for up to 3 days. Ensure the quiche is cooled completely before wrapping it tightly in plastic wrap or placing it in an airtight container.

Reheating: To reheat, warm the quiche in a preheated oven at 350°F (175°C) for 10-15 minutes, or until heated through. You can also reheat individual slices in the microwave, but the crust may become slightly softer.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	383.7 kcal	N/A
Calories from Fat	164 g	N/A
Total Fat	18.3 g	28%
Saturated Fat	6.7 g	33%
Cholesterol	118.3 mg	39%
Sodium	189.2 mg	7%
Total Carbohydrate	38.8 g	12%
Dietary Fiber	4.9 g	19%
Sugars	3.9 g	N/A
Protein	18.6 g	37%

Variations & Substitutions

• Gluten-Free: While this recipe already uses a potato crust, ensuring all ingredients are certified gluten-free will cater to gluten sensitivities.
• Dairy-Free: Substitute the milk with almond milk or soy milk and use a dairy-free cheese alternative.
• Vegetable Medley: Add other vegetables like bell peppers, zucchini, or sun-dried tomatoes to the filling for added flavor and nutrients.
• Herby Twist: Incorporate fresh herbs like thyme, rosemary, or oregano into the spinach-mushroom mixture for an aromatic variation.
• Spicy Kick: Add a pinch of red pepper flakes to the spinach-mushroom mixture for a touch of heat.

FAQs (Frequently Asked Questions)

Q: Can I use sweet potatoes instead of Yukon gold potatoes?
A: Yes, sweet potatoes can be used, but they will result in a sweeter crust. Adjust the seasoning accordingly.

Q: Can I make this quiche without a food processor?
A: Yes, you can shred the potatoes using a box grater, but it will take more time and effort.

Q: How do I know when the quiche is done?
A: The quiche is done when the filling is set and the center is firm to the touch. A slight jiggle is okay, as it will continue to set as it cools.

Q: Can I freeze this quiche?
A: Yes, you can freeze the quiche after it has been baked and cooled completely. Wrap it tightly in plastic wrap and then foil. It can be stored in the freezer for up to 2 months. Thaw overnight in the refrigerator before reheating.

Q: What can I serve with this quiche?
A: This quiche pairs well with a simple green salad, a cup of soup, or fresh fruit.

Final Thoughts

This Spinach-Mushroom Quiche with its unique potato crust is more than just a recipe; it’s an invitation to create a comforting and nourishing meal. With its earthy flavors and wholesome ingredients, it’s a dish that’s sure to please. So, gather your ingredients, preheat your oven, and embark on a culinary journey that will transport you to a world of simple, rustic delights. Don’t hesitate to experiment with variations and make it your own. Share your creations and feedback, and let’s celebrate the joy of cooking together!