Spinach Mushroom Quiche: The Foolproof Brunch Recipe

Spinach mushroom quiche is the brunch dish that does the most with the least: a buttery crust, a few eggs, a splash of cream, and two vegetables you almost always have on hand. The full recipe takes about an hour and a half (mostly hands-off baking time), feeds 8 people generously, and tastes as good cold the next morning as it does hot from the oven. The keys are simple: pre-bake the crust, cook the spinach and mushrooms separately, and don't over-egg the custard. This guide walks through the master recipe, the pastry from scratch, and shortcuts when you don't have an extra 90 minutes.

A few practical notes before you start. The biggest mistake people make with vegetable quiche is putting raw or watery vegetables straight into the custard. Spinach holds enormous amounts of water; raw mushrooms release more during baking. Cook both off before they meet the eggs and your quiche will set properly instead of weeping liquid on the cutting board.

What you need

Makes one 9-inch quiche, serves 6 to 8.

For the crust (or use 1 sheet of all-butter store-bought)

• 1 1/4 cups all-purpose flour
• 1/2 teaspoon kosher salt
• 1/2 teaspoon sugar
• 1/2 cup (1 stick) cold unsalted butter, cut into 1/2-inch cubes
• 3 to 5 tablespoons ice water

For the filling

• 10 oz fresh baby spinach (or 5 oz frozen, thawed and squeezed dry)
• 8 oz cremini or button mushrooms, sliced 1/4 inch thick
• 2 tablespoons unsalted butter
• 1 small shallot or 1/2 small onion, finely diced
• 2 cloves garlic, minced
• 1 teaspoon fresh thyme leaves
• 4 large eggs
• 1 cup heavy cream (or 3/4 cup cream + 1/4 cup whole milk)
• 1/2 teaspoon kosher salt
• 1/4 teaspoon black pepper
• 1/8 teaspoon ground nutmeg
• 3/4 cup grated Gruyere (or Swiss, or sharp cheddar)
• 2 tablespoons grated Parmesan

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Step 1: Make the crust

1. Whisk flour, salt, and sugar in a large bowl.
2. Drop in the butter cubes. Use your fingers or a pastry cutter to press the butter into the flour until you have a mix of pea-sized lumps and smaller flakes. Don't overdo it; visible butter is what gives you flaky layers.
3. Sprinkle 3 tablespoons of ice water over the mixture. Stir with a fork. Add more water 1 tablespoon at a time until the dough holds together when you squeeze a handful.
4. Tip onto a piece of plastic wrap, press into a disc, wrap, and refrigerate at least 1 hour (or up to 2 days).
5. Roll the chilled dough on a floured surface into a 12-inch round, about 1/8 inch thick. Transfer to a 9-inch pie plate or tart pan. Trim the edges, leaving a small overhang. Tuck the overhang under itself and crimp the edge.
6. Freeze the crust in the pan for 15 minutes (or refrigerate 30) before pre-baking.

Step 2: Pre-bake (blind bake) the crust

1. Preheat oven to 400°F.
2. Line the chilled crust with parchment paper. Fill with pie weights, dried beans, or rice (all the way to the top).
3. Bake 18 minutes, then carefully lift out the parchment and weights.
4. Return the crust to the oven for 8 more minutes until lightly golden across the bottom.
5. Let cool while you prepare the filling. Reduce oven to 350°F.

Blind baking is non-negotiable for vegetable quiche. A wet filling sitting on a raw crust gives you a soggy bottom that no amount of resting can fix.

Step 3: Cook the filling

1. Wilt the spinach. Heat 1 tablespoon butter in a wide pan over medium-high. Add the fresh spinach in batches, tossing as it wilts. Once all of it has collapsed (about 3 minutes), transfer to a strainer set over a bowl. Press out as much liquid as you can. Chop coarsely. (If using frozen spinach, just thaw and squeeze; skip the wilting.)
2. Brown the mushrooms. Wipe the pan, return to medium-high heat, and add the last tablespoon of butter. Add mushrooms in a single layer. Cook 3 minutes without stirring, then toss and continue cooking 4 to 5 more, until deep golden. Season with salt and pepper.
3. Add aromatics. Add the shallot and cook 2 minutes. Add garlic and thyme, cook 30 seconds. Remove from heat.
4. Combine. In a bowl, mix the spinach, mushroom mixture, and Gruyere.
5. Make the custard. In a separate bowl, whisk eggs, cream, salt, pepper, and nutmeg until smooth and light yellow.

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Step 4: Assemble and bake

1. Spread the vegetable-cheese mixture evenly in the pre-baked crust.
2. Pour the custard over the top. The custard should come almost to the top of the crust but not over.
3. Sprinkle the Parmesan over the surface.
4. Place the pan on a rimmed baking sheet (it catches any drips) and bake at 350°F for 35 to 45 minutes, until the center is just set with a slight jiggle. The top should be lightly golden.
5. Let cool at least 15 minutes before slicing. A warm quiche slices messily; a slightly rested one cuts cleanly.

How to tell when a quiche is done

The center is the slowest part to cook. When you nudge the pan, the center should jiggle like a set custard, not slosh like a liquid. Insert a thin knife in the center; it should come out clean (a little egg residue is fine, raw runny egg is not). The total time depends on your oven and the diameter of your pan, so check at 35 minutes and add time as needed.

Overbaked quiche turns rubbery and weeps water on the plate. Underbaked quiche pools liquid when sliced. The sweet spot is "just set with a wobble at the center."

Variations

With bacon

Cook 4 strips of bacon until crisp. Chop and fold in with the spinach and mushrooms. Replace 1 tablespoon of butter with 1 tablespoon of the rendered bacon fat for cooking the vegetables.

Three-cheese

Replace the Gruyere with a mix of 1/4 cup goat cheese, 1/4 cup sharp white cheddar, and 1/4 cup Gruyere. The result is creamier and more complex.

Crustless

Generously butter a 9-inch pie plate. Skip the crust entirely. Increase eggs to 6 and reduce cream to 3/4 cup. Bake at 350°F for 30 to 35 minutes. The texture is more frittata-like, but it's faster, gluten-free, and lower-carb.

With caramelized onions

In addition to the shallot, add 1 whole onion sliced and caramelized slowly in butter for 20 to 25 minutes. The sweet onion against the earthy mushrooms is one of the best flavor combinations in this whole recipe.

Wild mushroom version

Replace the cremini with a mix of oyster, shiitake, and maitake. Wild mushrooms have stronger flavors and slightly different textures, so the quiche tastes more complex. Mushrooms from mushroom grow kits grown at home work especially well here because they're harvested fresh and have less water to cook off.

Make-ahead and storage

Quiche actually improves slightly overnight. Bake, cool to room temperature, cover, and refrigerate. Serve cold, room temperature, or reheated. To reheat, cover loosely with foil and warm at 325°F for 12 to 15 minutes, or microwave individual slices for 90 seconds.

It keeps in the fridge for 4 days and freezes well for up to 2 months. Wrap individual slices in plastic and foil for grab-and-go portions. Thaw overnight in the fridge before reheating.

Shortcuts

• Store-bought crust. Use one 9-inch pie shell (refrigerated, not frozen, gives the best texture). All-butter brands like Wewalka or Trader Joe's are notably better than the cheap supermarket version.
• Frozen spinach. A 10-oz block, thawed and squeezed dry, replaces the fresh spinach with no loss in flavor. Saves 5 minutes and several pots.
• Pre-sliced mushrooms. Available at most grocery stores. Slightly more expensive but a real time saver.

What to serve it with

• A simple green salad with sharp vinaigrette
• Roasted potatoes or hash browns for a heartier brunch
• Fresh fruit, especially berries and citrus
• Mimosas or sparkling wine
• A pot of strong coffee

Common mistakes

• Skipping the blind bake. Soggy bottom guaranteed. Don't do it.
• Wet vegetables. Squeeze the spinach hard and brown the mushrooms properly. Both steps remove the water that would otherwise water down the custard.
• Overbaking. Pull it when the center jiggles. Carryover heat finishes the cooking.
• Slicing too soon. Wait 15 minutes minimum. The custard sets as it cools.
• Underseasoning. Eggs are bland. They need real salt. Don't be shy.

A good spinach mushroom quiche is a small triumph of technique. Once you've made it once, you'll find yourself reaching for the same template (crust + custard + cooked-down vegetable + cheese) for everything from leek to asparagus to broccoli. The math doesn't change, just the produce.