Recipe Mushroom Quiche: Flaky Crust With Earthy Richness

There’s something deeply satisfying about a well-made quiche, and this version with its flaky crust and earthy mushrooms is no exception. The buttery pastry provides the perfect foundation for the rich, savory filling.

I’ve refined this recipe to ensure the crust stays crisp while the custard sets just right. The mushrooms are sautéed to concentrate their flavor, and a touch of nutmeg in the filling adds subtle depth.

This dish works beautifully for brunch, lunch, or even a light dinner. The combination of textures—creamy filling, tender mushrooms, and that all-important flaky crust—makes every bite memorable.

Serve warm or at room temperature. Here’s how to make it.

Ingredients for Recipe Mushroom Quiche

A flaky pastry shell cradles sautéed mushrooms and creamy custard with nutmeg depth.

The crust demands precision. King Arthur Flour delivers consistent protein content for reliability, while European-style butter (like Plugrá) offers higher fat content for superior flakiness. Keep butter cold—freeze it 15 minutes before cubing. Ice water prevents gluten development, ensuring tenderness. For the mushrooms, cremini or baby bella varieties provide the earthiest flavor profile without overwhelming moisture.

No Gruyère? Comté or Emmental substitute beautifully. Out of heavy cream? Whole milk plus 2 tbsp melted butter works in a pinch (though less rich). Fresh nutmeg is worth the effort—pre-ground loses potency quickly. The shallot can be replaced with yellow onion at a 1:1 ratio. For dairy sensitivity, whole-fat coconut milk creates a creamy custard alternative.

The assembled quiche keeps 3-4 days refrigerated. Freeze unbaked crusts for 1 month—thaw before filling. Sautéed mushrooms can be prepped 1 day ahead and chilled. Always blind-bake the crust to prevent sogginess. Serve at room temperature for optimal texture harmony.

Step-by-Step Instructions for Mushroom Quiche

Master the technique for a golden crust and rich, savory filling that never disappoints.

Step 1: Prepare the Flaky Pie Crust

In a food processor, pulse the 1.5 cups all-purpose flour with the 0.5 tsp salt to combine. Add the 0.5 cup unsalted butter, cubed and chilled, and pulse until the mixture resembles coarse crumbs with pea-sized butter pieces visible.

With the processor running, drizzle in the 0.25 cup ice water through the feed tube, 1 tablespoon at a time, until the dough just begins to clump together. The dough should hold when pressed but not be sticky. This careful hydration ensures a tender, flaky texture.

Turn the dough onto a lightly floured surface and shape into a disk. Wrap in plastic and refrigerate for 30 minutes—this resting period allows the gluten to relax, preventing shrinkage during baking.

Step 2: Blind Bake the Crust

On a lightly floured surface, roll the chilled dough into an 11-inch circle. Transfer to a 9-inch pie dish, pressing gently into the bottom and up the sides. Trim excess dough, leaving a slight overhang, then crimp the edges decoratively.

Line the crust with parchment paper and fill with pie weights or dried beans. Preheat the oven to 375°F and bake for 15 minutes. Remove the weights and parchment, then bake for another 5-7 minutes until the crust is lightly golden and set.

This blind baking step prevents a soggy bottom, ensuring your quiche has that coveted crisp base to support the rich filling.

Step 3: Sauté the Mushroom Filling

Heat the 2 tbsp olive oil in a large skillet over medium-high heat. Add the 1 lb cremini mushrooms, sliced, and cook undisturbed for 3 minutes to develop a deep, golden sear.

Stir in the 1 whole shallot, finely diced, and cook for 2-3 minutes until softened and translucent. Add the 2 cloves garlic cloves, minced, and sauté for 30 seconds until fragrant. Season with 0.5 tsp black pepper and remove from heat. The mushrooms should be tender with a rich, earthy aroma.

Transfer the mushroom mixture to a bowl and let cool slightly. This prevents the eggs from scrambling when combined.

Step 4: Assemble and Bake the Quiche

In a large bowl, whisk together the 4 whole large eggs, 1 cup heavy cream, and 0.5 cup whole milk until smooth. Stir in the 1 cup Gruyère cheese, 0.5 cup Parmesan cheese, and 0.25 tsp ground nutmeg.

Spread the sautéed mushroom mixture evenly over the pre-baked crust. Pour the egg mixture over the mushrooms, ensuring it fills all gaps. The custard should come to the rim but not overflow.

Bake at 375°F for 35-40 minutes until the center is set with a slight jiggle and the top is golden brown. Let rest for 10 minutes before slicing to allow the custard to set fully.

Storing and Reheating Leftovers

Refrigerator Storage

Let your quiche cool completely, then wrap it tightly in plastic wrap or transfer to an airtight container. It’ll keep beautifully in the fridge for 3-4 days. I love that the flavors deepen overnight. ❄️

Freezer Storage

For longer storage, freeze the quiche unbaked or baked. Wrap the whole pie or individual slices in aluminum foil and plastic wrap, then store in a freezer bag for up to 2 months. Label with the date to keep track.

Reheating from Fridge

Preheat your oven to 350°F and warm slices on a baking sheet for 10-15 minutes. This restores the crust’s crispness. Cover with foil if the top browns too quickly. 🔥

Reheating from Freezer

Thaw the quiche overnight in the fridge, then reheat as above. For individual slices, microwave on 50% power for 2-3 minutes, checking frequently. A splash of milk can revive the custard’s creaminess.

Serving Temperature

This dish shines warm or at room temperature. If serving cold, let it sit out for 30 minutes after refrigeration. The flaky crust and creamy filling are best enjoyed when not stone-cold.

Frequently Asked Questions