Spinach Mushroom Quiche

A foolproof, deeply savory spinach mushroom quiche with a flaky, buttery crust and a perfectly set, velvety custard that never turns watery.

Why This Recipe Works:

• Sautéing the mushrooms triggers the Maillard reaction, intensifying their savory flavor while driving off excess moisture.
• Squeezing the wilted spinach dry prevents water from diluting the egg custard, ensuring a velvety, sliceable texture.
• Using heavy cream instead of milk provides enough milk fat to prevent the eggs from curdling, creating a luxurious mouthfeel.

My first quiche was a weeping, soggy disaster that pooled at the bottom of a cheap pie pan.

I was twenty-two, hosting my first brunch, and too proud to admit I had absolutely no idea how to handle wet vegetables, so I just threw them in raw.

Think about this in terms of physics.

Mushrooms and spinach are basically water balloons disguised as food, and when baked, they release their moisture, completely destroying the delicate protein matrix of the egg custard. I tested this with three different store-bought crusts, and one generic brand failed every single test because it slumped down the sides of the pan during blind baking, which got annoying fast.

To fix this, we must aggressively sauté the mushrooms and squeeze the wilted spinach until your forearms ache.

This step is non-negotiable because removing that moisture ensures a rich, velvety custard that slices cleanly. If you prefer a lighter, crust-free version, you can always try our crustless spinach quiche instead.

Spinach Mushroom Quiche

• Publisher Storied Skillet
• Cuisine French
• Category Breakfast, Brunch
• Prep Time 25 mins
• Cook Time 45 mins
• Servings 8
• Calories 320 calories
• Rating 4.8 4047
• Tags spinach mushroom quiche, breakfast quiche, brunch recipe, savory pie

Ingredients

• 1 unbaked 9-inch pie crust
• 1 tbsp unsalted butter
• 8 oz cremini mushrooms, sliced
• 5 oz fresh baby spinach
• 1/2 cup shallots, finely chopped
• 1 cup Gruyère cheese, shredded
• 4 large eggs
• 1 1/4 cups heavy cream
• 1 tsp Diamond Crystal kosher salt
• 1/4 tsp freshly cracked black pepper
• 1/8 tsp ground nutmeg

Directions

1. Preheat oven to 375°F (190°C). Roll out the pie crust and press it into a 9-inch pie plate, crimping the edges with your thumbs.
2. Line the crust with parchment paper, fill with pie weights or dried beans, and blind bake for 15 minutes. Remove weights and bake for another 5 minutes until pale golden, then set aside.
3. Melt butter in a large skillet over medium-high heat. Add sliced cremini mushrooms and sauté for 8-10 minutes until deeply browned and all moisture has evaporated.
4. Stir in the shallots and cook for 2 minutes until soft. Add the baby spinach, tossing constantly until completely wilted, about 2 minutes.
5. Transfer the spinach and mushroom mixture to a colander. Once cool enough to handle, wrap the mixture in a clean kitchen towel and squeeze firmly to extract all remaining liquid.
6. In a medium bowl, whisk together the eggs, heavy cream, Diamond Crystal kosher salt, black pepper, and ground nutmeg until completely smooth.
7. Scatter half of the shredded Gruyère cheese over the bottom of the par-baked crust, followed by the squeezed spinach and mushroom mixture. Top with the remaining cheese.
8. Pour the egg custard mixture slowly over the fillings. Bake for 35 to 40 minutes, or until the edges are set but the center still has a slight, gentle jiggle. Let cool for 15 minutes before slicing.

Notes

• I highly recommend using Diamond Crystal kosher salt; if you are using standard fine table salt, cut the measurement in half (use 1/2 teaspoon instead of 1 teaspoon) to avoid an over-salted custard.
• Heavy cream is essential here because its high fat content coats the egg proteins, preventing them from bonding too tightly and squeezing out water, which is what causes a quiche to curdle or turn watery.
• Keep a close eye on your crust during the blind baking step; if the edges start browning too quickly before the custard is added, wrap them loosely in aluminum foil to prevent them from burning later.
• As this quiche sits in the fridge, the crust will naturally lose some of its crispness due to starch retrogradation, but reheating it in a hot oven (rather than a microwave) will easily revive that buttery crunch.
• If you love savory spinach breakfasts but want to skip the pie crust entirely, try our cottage cheese and spinach crustless quiche for a high-protein alternative.

Serving Suggestions

This quiche is a showstopper on its own, but pairing it with the right sides transforms it into an elegant, complete meal.

• A crisp, bright green salad dressed with a simple lemon vinaigrette to cut through the richness of the custard.
• A side of warm, roasted potatoes or our savory Sumac Herb Potato Salad for a hearty brunch spread.
• Fresh seasonal fruit, like sliced melons, berries, or a light citrus salad.
• A basket of warm pastries, such as our flaky Spinach and Feta Puff Pastry Twists for the ultimate bakery-style experience.
• A hot cup of coffee or a refreshing glass of iced tea to balance the savory flavors.

Storage and Reheating

Leftover quiche is a genuine gift.

The flavors meld and deepen beautifully after a night in the refrigerator, so wrap any remaining slices tightly in plastic wrap or store them in an airtight container for up to four days.

When it comes to reheating, please step away from the microwave.

Microwaving ruins the delicate protein matrix of the custard, turning it rubbery, while simultaneously making the crust sad and soggy. Instead, place your cold slice on a baking sheet and heat it in a 325°F (160°C) oven for about 15 minutes.

This gentle heat warms the custard evenly without overcooking the eggs, reviving that buttery crunch.

Ingredient Substitutes

If you don't have all the ingredients on hand, these simple swaps will keep your quiche delicious without ruining the texture.

1. Gruyère Cheese: Substitute with sharp white cheddar, Swiss cheese, or even crumbled feta if you want a tangy kick similar to our Spinach Frittata with Feta.
2. Cremini Mushrooms: White button mushrooms or wild mushrooms like shiitake work beautifully; just ensure they are thoroughly sautéed to remove moisture.
3. Shallots: You can easily swap shallots for finely chopped yellow onion or leeks, making sure to cook them until sweet and translucent.
4. Heavy Cream: While heavy cream yields the best texture, you can use whole milk mixed with a tablespoon of melted butter, though the custard will be slightly less velvety.

There is something incredibly satisfying about pulling a golden, puffed quiche out of the oven and hearing that delicate crackle of the crust as you slice into it. It’s the ultimate comfort food made elegant, and once you master the simple science of keeping the fillings dry, you’ll want to make it every single weekend.