This high-rising, custardy, mushroom quiche is packed with sautéed mushrooms, a silky egg mixture, and melty cheese layered in a buttery, flaky, gluten-free crust.
Let’s get one thing straight—this isn’t your grocery store’s grab-and-go quiche. No offense to the shrink-wrapped version, but Thomas Keller’s mushroom quiche? It’s a full-blown culinary power move. We’re talking about a golden brown pie shell stuffed with sautéed mushrooms, layers of gooey cheese, and an egg mixture so smooth it's silky.
If you’re a mushroom lover, this one’s for you. If you’re not? Well, you might be by the time you finish reading.
Who Is Thomas Keller?
James Beard Award-winner. Perfectionist. The guy behind The French Laundry, Per Se, and Bouchon. Thomas Keller isn’t just a chef—he’s the chef. He doesn’t just elevate food; he makes it do backflips. And when he says, "I love quiche, but it has to be several inches high and made right," you better believe we’re listening.
Keller’s take on quiche isn't about cutting corners. It’s about craft. About using ingredients that matter—whole milk, heavy cream, large eggs at room temperature, and yes, the best gluten-free pie shell you’ve ever tasted.
Why This Mushroom Quiche Is the Best Quiche, Period
Let’s break it down. Why does this particular mushroom quiche deserve a spot at your next special occasion?
- A mushroom mixture that actually tastes like mushrooms. We’re talkin’ two types of sautéed mushrooms cooked down with thyme and shallots in olive oil and butter until they’re rich and caramelized.
- A silky egg mixture that won’t break. No curdling, no rubbery bite—just pure custard magic.
- Cheese, layered like you mean it. Comté or Gruyère cheese (or Emmental if you’re fancying a switch) gets tucked between the mushroom filling, so every bite melts just right.
- Pastry shell perfection. Pre-baked, cooled, and loaded up, this gluten-free pie shell stands tall—no soggy quiche allowed here.
Oh, and did I mention this thing bakes for 90 minutes? That’s dedication. That’s flavor. It's the Thomas Keller difference.
Let’s Talk Mushrooms 🍄
Now, the real MVP here is the mushrooms. Or rather, the type of mushrooms. This recipe calls for white mushrooms and oyster mushrooms, but don’t stop there. Mix it up with shiitakes or maitakes if you're feeling bold. The point is, don’t skimp—this isn’t the time for sad, slimy slices.
And speaking of mushrooms, ever wonder where the best Fungi comes from? California, of course!
At Far West Fungi, they’re cultivating gourmet mushrooms like they’re aging wine. Temperature, humidity, and air quality all play a role. It’s a science, an art, and a whole lot of compost.
“Growing mushrooms is about replicating nature indoors.”
— From CA GROWN’s Far West Fungi feature
Want to try your hand at growing your own? You can. Check out This Mess is Ours for a DIY guide that doesn’t feel like science class.
Anatomy of a Killer Quiche Filling
The structure of this mushroom quiche is like an architectural blueprint. You’ve got:
- A fully baked pie shell made from gluten-free pie dough (hello, Cup4Cup).
- A first layer of shredded Comté or Emmental cheese.
- Half the cooked mushrooms (don’t forget to season those sautéed mushrooms properly).
- An egg mixture made from whole milk, heavy cream, and large eggs at room temperature—blitzed in a blender until frothy.
- More cheese. More mushrooms.
- A final pour of custard and a last sprinkle of cheese.
Every layer serves a purpose. This is how you keep the center of the quiche set and avoid that dreaded soggy bottom.
Pro Tips from the Culinary Frontline
Let’s get real. This is not a “quick and easy quiche" recipe; it requires a little time and patience to make. But it’s a satisfying one. Here are a few survival tips:
- Parchment paper is your friend. Cleanup of any spills or mishaps will be a breeze.
- Bake it low and slow. A 325° F (170° C) oven keeps that egg mixture from turning into scrambled regrets.
- Let it rest. Do not dive in hot. Let the custard firm up as it cools so it slices clean.
Also? Don’t overbake it. You want a gentle jiggle in the center of the quiche—like a firm handshake, not a limp one.
Quiche Isn’t Just for Brunch
Don't sequester this mushroom quiche to side dish status. This mushroom quiche is a main dish in every sense. Serve it with a light salad or a crisp white wine, and you've got dinner.
Got leftovers? It reheats like a dream. Just pop it in a 350°F (180 °C) oven until warmed through. The flaky crust stays crisp, the filling stays creamy, and the mushroom flavor gets even deeper.
Hosting a crowd? Make two. Freeze one for later. Thomas Keller would approve.
For the Quiche Curious
If you’re just dipping your toes into the wide world of quiche, don’t stop here. There’s a whole variety of quiche recipes out there. But if you want the gold standard—the one quiche to rule them all—this is it.
The buttery, golden edges of the crust, the rich mushroom filling, the balance of nutty cheese and herbs? This is the kind of dish that makes people go silent at the table. That’s the goal, right?
If you find yourself looking for more fantastic quiche recipes to try, give my recipe for Tomato And Green Onion Gluten-Free Quiche a whirl.
The Final Slice
So, here’s the deal. Thomas Keller’s Over-The-Top Mushroom Quiche isn’t just a recipe—it’s a full-on experience. You may curse at your knife skills. You’ll second-guess your egg mixture. You might even panic at the wobbly center of the quiche. But when you take that first bite?
Totally worth it.
In Summary (because I know some of you just scroll for this part):
- It’s the best quiche you’ll ever make.
- Features a mushroom mixture of sautéed oyster and white mushrooms.
- Loaded with cheese and a custard made from heavy cream, whole milk, and large eggs.
- Baked in a flaky crust (preferably using this recipe).
- It’s perfect for a special occasion or a serious brunch flex.
- Serve warm or at room temperature, ensuring it slices cleanly.
- Savor every bite.
"I love quiche, but it has to be several inches high and made right," says star chef Thomas Keller. This high-rise version is adapted from his Bouchon cookbook, and is worth the time it takes to prepare.
Over-the-Top Mushroom Quiche
Ingredients
- 1 tablespoon vegetable oil
- 1 lb oyster mushrooms stems trimmed and large caps halved or quartered
- 1 lb white mushrooms thinly sliced
- Salt and freshly ground white pepper
- 1 tablespoon unsalted butter
- 2 small shallots minced
- 1 tablespoon thyme chopped
- ¾ cup shredded Comté or Emmental cheese about 2 ½ ounces before shredding
- Buttery Pastry Shell Click here for my gluten-free pie shell recipe or use your favorite recipe.
- 2 cups milk
- 2 cups heavy cream
- 6 large eggs lightly beaten
- Freshly grated nutmeg
Instructions
- Preheat the oven to 325° F (170° C). In a very large skillet, heat the oil.
- Add the oyster and white mushrooms, season with salt and pepper and cook over high heat stirring continually until starting to soften, about 5 minutes. Reduce the heat to moderate.
- Add the butter, shallots and thyme and cook, stirring often, until the mushrooms are tender, about 12 minutes longer. Season with salt and pepper and let cool.
- Scatter ⅓ of the cheese and half of the mushrooms evenly over the bottom of the Buttery Pastry Shell.
- In a blender, mix half each of the milk, cream and eggs and season with 1 ½ teaspoons of salt, ⅛ teaspoon of pepper and a pinch of nutmeg at high speed until frothy, about 1 minute. Pour the custard into the pastry shell. Top with another ⅓ of cheese and the remaining mushrooms.
- Make a second batch of custard with the remaining milk, cream and eggs, plus the same amount of salt, pepper and nutmeg as before and pour into the shell. Scatter the remaining cheese on top.
- Bake the quiche for about 1 ½ hours, or until richly browned on top and the custard is barely set in the center. Let cool in the pan until very warm.
- Using a serrated knife, cut the pastry shell flush with the top of the pan. Carefully lift the springform pan ring off the quiche. Cut the mushroom quiche into wedges, transfer to plates and serve warm.
Video
Notes
Nutrition
Photos by James Collier
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