Name: Tasty Spinach Mushroom Quiche
Prep time: 20 min
Cook time: 40 min
Total time: 60 min
Ingredients: 1 9-inch unbaked pie crust; 1 tablespoon olive oil; 1 cup sliced mushrooms; 2 cups fresh spinach, roughly chopped; 1/2 cup diced onion; 4 large eggs; 1 cup milk or half-and-half; 1 cup shredded cheese (such as Swiss or cheddar); 1/2 teaspoon salt; 1/4 teaspoon black pepper; 1/4 teaspoon garlic powder; 1/4 teaspoon dried thyme

Tasty Spinach Mushroom Quiche tastes savory and custardy with buttery crust, tender mushrooms, sweet onions, and a gentle hint of nutmeg. It suits brunch fans, meal preppers, and veggie lovers, and it takes about 1 hour 15 minutes from prep to slice. I first baked this after a farmers market haul and felt like a brunch hero by noon.

Why Choose This Tasty Spinach Mushroom Quiche

This Tasty Spinach Mushroom Quiche gives you a flaky crust, silky egg custard, and deep mushroom flavor in every bite. It works for breakfast, lunch, or a light dinner and holds up well for leftovers.

You can use a store-bought crust, a skillet, and basic fridge staples. You still get that bakery-style quiche without fuss.

Ingredients You Need

1 refrigerated 9-inch pie crust or a frozen deep-dish shell (Pillsbury and Trader Joe’s both bake well). Homemade crust works too if you keep it cold.
1 tablespoon olive oil + 1 tablespoon butter
8 ounces cremini or white mushrooms, sliced
1 small yellow onion, diced, or 2 shallots, minced
2 cloves garlic, minced
5 ounces fresh baby spinach, roughly chopped
- Shortcut: use 10 ounces frozen chopped spinach, thawed and squeezed very dry
4 large eggs
1 cup half-and-half
- Swap: use 1/2 cup whole milk + 1/2 cup heavy cream
1 cup shredded Gruyere or Swiss
- Swap: sharp cheddar for bolder flavor, or 1/2 cup feta + 1/2 cup low-moisture mozzarella
1 teaspoon Dijon mustard
1 teaspoon fresh thyme leaves or 1/2 teaspoon dried thyme
1/4 teaspoon ground nutmeg
1/2 teaspoon kosher salt, plus more to taste
1/4 teaspoon freshly ground black pepper
Pinch of red pepper flakes, optional
2 tablespoons grated Parmesan for the top, optional

Equipment:

9-inch pie dish if using refrigerated crust, or use a deep-dish pie shell
Large skillet
Mixing bowl and whisk
Measuring cups and spoons
Sheet pan to support the pie dish
Foil, parchment, and pie weights or dried beans
Cooling rack
Sharp knife and cutting board

How to Make Tasty Spinach Mushroom Quiche

Heat oven to 375°F. Fit the crust into a 9-inch pie dish, prick the bottom with a fork, line with parchment, and fill with pie weights.
Bake 12 to 14 minutes until the edges look set. Remove weights and parchment, then bake 3 to 5 minutes more until the bottom looks dry. Set the crust on a sheet pan to catch any drips.

Cook the mushrooms and aromatics, 10 to 12 minutes

Heat oil and butter in a large skillet over medium-high heat. Add mushrooms in a single layer and let them brown for 3 to 4 minutes before you stir.
Stir in onion with a pinch of salt and cook until the onion turns translucent and the mushrooms release and reabsorb their juices. Add garlic and thyme, then cook 1 minute more.

Wilt the spinach, 2 to 3 minutes

Add fresh spinach to the skillet and toss until it wilts and most moisture cooks off. If using frozen spinach, add it now and cook until dry.
Taste the mixture and season with salt and pepper. Cool the mixture for a few minutes so it does not melt the cheese on contact.

Mix the custard, 3 minutes

Whisk eggs, half-and-half, Dijon, nutmeg, 1/2 teaspoon salt, and 1/4 teaspoon pepper in a bowl until smooth.
Stir in most of the cheese, keeping a small handful for the top.

Assemble, 5 minutes

Spread the mushroom spinach mixture evenly in the crust. Pour the custard over the top and nudge it so it settles.
Sprinkle the remaining cheese and Parmesan over the surface.

Bake, 35 to 40 minutes

Bake at 375°F until the center barely wobbles and the top turns golden, about 35 to 40 minutes. If the edges brown too fast, tent the rim with foil.
The custard will finish setting as it cools, so pull it while the center still looks soft.

Cool and slice, 15 to 20 minutes

Let the quiche rest on a rack for at least 15 minutes before slicing. This pause gives you neat slices and a crisp crust.
Slice with a sharp knife and serve warm or at room temp.

Tips & Common Mistakes

Blind-bake the crust so the bottom stays crisp.
Cook mushrooms hot and avoid crowding to prevent steaming and sogginess.
Squeeze frozen spinach very dry or your custard will turn watery.
Season the vegetables in the pan to lock in flavor before they hit the custard.
Use room temperature eggs and dairy to help the custard mix smoothly.
Shred cheese from a block for better melt and fewer clumps.
Do not overfill the crust. Leave a little headroom to avoid spills.
Pull the quiche while the center still jiggles slightly. It sets as it cools.
Cool on a rack to keep the crust from softening.

Variations I’ve Tried

Caramelized onion, spinach, and goat cheese with a drizzle of honey on top.
Bacon mushroom quiche with sharp cheddar for a smoky twist.
Broccoli and cheddar with a pinch of paprika.
Leek, spinach, and feta with dill.
Crustless quiche in a greased pie dish. Bake 25 to 30 minutes since it sets faster.
Gluten-free crust from almond flour or your favorite store-bought GF crust.
Mini quiches in a muffin tin. Bake 18 to 22 minutes at 350°F.

How to Serve

Serve Tasty Spinach Mushroom Quiche warm with a crisp green salad and lemon vinaigrette. Add a side of roasted potatoes or a simple fruit salad for a fuller plate. Pair it with sparkling wine at brunch, or pour hot coffee or herbal tea for a cozy morning. A little hot sauce or chili crisp on the side perks up each slice.

Make-Ahead and Storage

Make-ahead plan: blind-bake the crust and cook the vegetable mixture up to 2 days in advance. Keep both chilled. Assemble and bake the quiche the day you plan to serve.
Fridge: store slices or the whole quiche tightly wrapped for 3 to 4 days.
Freezer: cool completely, wrap slices in plastic and foil, and freeze up to 2 months. Label for sanity.
Reheat: warm slices in a 325°F oven on a sheet pan for 12 to 18 minutes until hot and the crust turns crisp. Air fryer at 300°F for 5 to 7 minutes also works.
From frozen: reheat wrapped slices in a 325°F oven for 25 to 35 minutes, then unwrap for the last few minutes to crisp the crust. Thaw overnight in the fridge for the best texture.

Ally Sanders