Name: Spinach & Mushroom Quiche Recipe
Prep time: 25 min
Cook time: 40 min
Total time: PT-494735H40M45S
Cuisine: American
Ingredients: 2 tablespoons extra-virgin olive oil; 8 ounces sliced fresh mixed wild mushrooms (such as cremini, shiitake, button, and/or oyster mushrooms); 1 ½ cups thinly sliced sweet onion; 1 tablespoon thinly sliced garlic; 5 ounces fresh baby spinach (about 8 cups), coarsely chopped; 6 large eggs; ¼ cup whole milk; ¼ cup half-and-half; 1 tablespoon Dijon mustard; 1 tablespoon fresh thyme leaves, plus more for garnish; ¼ teaspoon salt; ¼ teaspoon ground pepper; 1 ½ cups shredded Gruyère cheese

Jump to Recipe· 4.3 from 11 reviews

I absolutely adore this Spinach & Mushroom Quiche Recipe because it offers that perfect blend of earthy mushrooms, fresh spinach, and nutty Gruyère cheese packed into a comforting, crustless quiche. It’s a dish I often turn to when I want something wholesome yet indulgent without the fuss of preparing pastry. Whether it’s for a cozy breakfast or a light lunch, this quiche feels like a warm hug on a plate, and I can’t wait to share all the reasons why you’ll love it as much as I do.

Why You’ll Love This Spinach & Mushroom Quiche Recipe

One of the things that makes this quiche so special to me is its incredible flavor profile. The combination of sweet wild mushrooms and caramelized onions creates a rich, savory base that’s beautifully balanced by the fresh brightness of spinach and the creamy, slightly nutty Gruyère cheese. Every bite bursts with cozy, layered flavors that are anything but ordinary.

What I also appreciate is how straightforward this recipe is to put together. There’s no delicate pie crust to fuss over, which instantly makes it less intimidating and much quicker to prepare. I love making it for weekends when I want to impress friends or treat my family without spending hours in the kitchen. It’s versatile, too—you can serve it warm, at room temperature, or even chilled, making it ideal for brunches, picnics, or easy weeknight dinners. For me, it stands out as a dependable, crowd-pleasing dish that somehow feels both elevated and homey.

Ingredients You’ll Need

The image shows a top view of cooking ingredients arranged on a white marbled surface. There is a white bowl filled with fresh green spinach leaves on the right side, next to several whole brown eggs lying on a striped cloth. In the center, there is a block of yellow cheese with smooth texture. Multiple types of mushrooms with different shapes and colors, including white, beige, and light brown, are spread out on the left side. Around the mushrooms are small containers, one holding cloves of garlic, and another with a mix of salt and black pepper. There are two half onions placed in the upper right corner, with their skins partially removed. Two clear glass bowls contain a light yellow oil and a white liquid. Fresh thyme sprigs add a touch of green near the bottom left. photo taken with an iphone --ar 4:5 --v 7

The ingredients for this Spinach & Mushroom Quiche Recipe are simple but essential; each one adds a unique note to the flavor, texture, and color of the dish. From the earthy mushrooms to the fresh thyme and buttery Gruyère, everything works in harmony to create a quiche that’s both wholesome and delicious.

Extra-virgin olive oil: Provides a rich base for sautéing the mushrooms and onions, enhancing their natural flavors.
Mixed wild mushrooms: A blend of cremini, shiitake, button, or oyster mushrooms adds depth and variety to taste and texture.
Sweet onion: Adds a subtle sweetness that balances the earthiness of the mushrooms perfectly.
Garlic: Lends aromatic warmth and enhances all the savory flavors.
Fresh baby spinach: Brings vibrant color and a light, healthy freshness to the quiche.
Large eggs: The binding agent that turns the filling silky and custardy.
Whole milk and half-and-half: Create a creamy custard base that’s luscious without being heavy.
Dijon mustard: Adds a subtle tang that lifts the overall flavor.
Fresh thyme leaves: Infuse a gentle herbaceous note throughout the dish, with extra for garnish.
Salt and ground pepper: Essential to season and balance all the flavors.
Gruyère cheese: Provides a wonderfully melty, nutty, and slightly sweet bite that makes the quiche irresistible.

Directions

Step 1: Preheat your oven to 375 degrees Fahrenheit. Lightly coat a 9-inch pie pan with cooking spray to make sure the quiche doesn’t stick once baked, then set it aside.

Step 2: Heat the extra-virgin olive oil in a large nonstick skillet over medium-high heat. Swirl the oil to coat the pan evenly—that’s the secret to even cooking and great color on the mushrooms.

Step 3: Add the sliced mushrooms to the skillet and cook, stirring occasionally, until they turn a beautiful golden brown and become tender. This usually takes about 8 minutes and is when the mushrooms develop their rich umami flavor.

Step 4: Toss in the sliced sweet onion and thinly sliced garlic. Cook everything together, stirring often, until the onions soften and become translucent—about 5 minutes. The aroma at this point is just delightful.

Step 5: Add the chopped fresh spinach to the skillet and toss constantly until wilted, which should only take around 1 to 2 minutes. Remove the skillet from heat and let the mixture cool slightly so the eggs don’t scramble later.

Step 6: In a medium bowl, whisk together the eggs, whole milk, half-and-half, Dijon mustard, fresh thyme leaves, salt, and pepper until everything is well combined and smooth.

Step 7: Fold the mushroom, onion, and spinach mixture gently into the egg mixture, then stir in the shredded Gruyère cheese until evenly distributed.

Step 8: Pour the filling into the prepared pie pan, smoothing the top with a spatula. Bake the quiche in the preheated oven for about 30 minutes, or until the filling is set and the top turns a lovely golden brown.

Step 9: Once baked, allow the quiche to rest for at least 10 minutes. This step is crucial because it helps the quiche finish setting and makes slicing easier. Garnish with extra fresh thyme before serving to add a pretty and fresh touch.

Servings and Timing

This Spinach & Mushroom Quiche Recipe yields one 9-inch quiche, which comfortably serves six generous slices. You can expect about 25 minutes of active prep time to get everything ready and sizzling in the pan. Baking time takes roughly 30 minutes, and you’ll want to allow an additional 10 minutes for resting before slicing and serving. In total, you’re looking at just over an hour from start to finish, but the hands-on part is pretty quick and easy.

How to Serve This Spinach & Mushroom Quiche Recipe

A round silver pan holds a cooked mix of green spinach leaves and various white and light brown mushrooms scattered evenly across the pan's surface. A single wooden spoon rests diagonally inside the pan, with its smooth texture and natural wood color contrasting against the cooked vegetables. The background features a white marbled surface, adding brightness and contrast to the earthy colors in the pan. photo taken with an iphone --ar 4:5 --v 7

When it comes to serving this quiche, I love pairing it with a crisp, lightly dressed green salad—something simple like arugula with lemon vinaigrette or a mixed spring greens salad. The freshness and acidity of the salad complement the rich, creamy texture of the quiche perfectly. Roasted cherry tomatoes or a side of lightly sautéed asparagus are other fantastic accompaniments if you want to elevate the meal even more.

For presentation, I find that slicing the quiche into neat wedges looks beautiful on a simple white plate, topped with a sprinkle of fresh thyme leaves or even a pinch of freshly cracked black pepper. If you want to make it a little fancier, a thin drizzle of truffle oil on top right before serving never fails to impress guests. This quiche tastes amazing warm but is also delightful at room temperature or chilled, making it ideal for buffet-style meals or picnic spreads.

In terms of drinks, I often enjoy it with a glass of chilled dry white wine like Sauvignon Blanc or a light Pinot Grigio. For non-alcoholic options, a sparkling water with a squeeze of lemon or a refreshing iced herbal tea pairs beautifully and keeps the meal feeling light. This quiche is versatile enough to serve for brunch, a light lunch, or even a casual dinner, making it one of my favorite all-rounders.

Variations

I love how adaptable this Spinach & Mushroom Quiche Recipe is. If you want to switch things up, try using different cheese varieties like feta for a tangier bite or sharp cheddar for a more robust flavor. You can also play around with the mushrooms—shiitake or portobello create a deeper, earthier taste, while cremini keep it mild and tender.

If you need this recipe to be gluten-free, you’re already in luck since it’s crustless! For a vegan twist, consider swapping the eggs and dairy for a tofu-based filling using silken tofu blended with nutritional yeast and turmeric for color and flavor. I’ve also experimented with adding fresh herbs like rosemary or parsley for a different herbal profile, and you can sprinkle in some chili flakes if you want a hint of heat.

For an alternative cooking method, using a cast-iron skillet provides a lovely crispy edge on the quiche when baked directly in it. You can also make individual portions in muffin tins if you’re hosting brunch or want easy grab-and-go servings. The possibilities feel endless once you get creative.

Storage and Reheating

Storing Leftovers

After enjoying your quiche, you can store any leftovers in an airtight container and keep them in the refrigerator for up to five days. I recommend slicing it into portions before storing to make reheating easier and more convenient. Using a glass or BPA-free plastic container with a tight-fitting lid helps maintain freshness and prevents the quiche from absorbing other fridge odors.

Freezing

This quiche freezes well if you want to make it ahead and save portions for later. Wrap individual slices tightly in plastic wrap and then place them in a zip-top freezer bag or airtight container. They will keep nicely for up to one month. When you’re ready to eat, thaw overnight in the fridge for best results. Avoid freezing the whole quiche to prevent sogginess upon reheating.

Reheating

To warm up your leftover Spinach & Mushroom Quiche Recipe, I recommend reheating it in the oven at 350 degrees Fahrenheit for 15 to 20 minutes until warmed through. This method preserves the texture and gives the top a little crispness again. Microwaving is quicker but can make the custard a bit rubbery, so if you choose that route, do so in short bursts and consider adding a dab of butter or cheese to help maintain moisture.

FAQs

Why is my quiche watery?

Watery quiche can happen if the vegetables release too much moisture or if the filling has too much liquid. To avoid this, make sure to sauté the mushrooms, onions, and spinach thoroughly to evaporate excess water before adding them to the eggs. Also, don’t overdo the milk and cream quantities and allow the quiche to rest after baking so excess liquid can absorb back into the filling.

What should I serve with Spinach & Mushroom Quiche?

I like serving this quiche alongside a fresh green salad, roasted vegetables, or light soups. It pairs wonderfully with citrusy dressings or tangy sides that cut through the richness. Adding some crusty bread or a fresh fruit salad can also round out the meal beautifully.

Can I make this quiche ahead of time?

Absolutely! You can prepare and bake the quiche ahead of time, then refrigerate it for up to five days. It’s perfect for prepping on busy mornings or when hosting brunch. Simply cover it well and reheat before serving.

Is it possible to add meat to this quiche?

If you’re not vegetarian, diced cooked bacon or crumbled sausage make excellent additions that complement the mushrooms and spinach nicely. Just cook the meat fully before mixing it into the filling.

Can I use frozen spinach instead of fresh?

You can substitute frozen spinach, but be sure to thaw it completely and squeeze out all excess moisture before cooking. This step prevents the quiche from becoming soggy and watery.

Conclusion

I hope you feel inspired to make this Spinach & Mushroom Quiche Recipe soon because it truly is one of my favorite go-to dishes that balances ease, flavor, and wholesome ingredients perfectly. Whether you’re enjoying it for a weekend brunch, a light family dinner, or packing it for a picnic, it never fails to impress and satisfy. Trust me, once you try it, this quiche will quickly become a beloved staple in your kitchen too!