Spinach Mushroom Quiche

This Spinach Mushroom Quiche is the kind of recipe that works just as well for a lazy weekend breakfast as it does for lunch or a simple dinner. It has a flaky pie crust filled with tender spinach, earthy mushrooms, creamy eggs, and plenty of cheese. The vegetables are cooked first so they lose excess moisture and develop more flavor before going into the quiche. That small step makes a noticeable difference in the final texture. The recipe is inspired by the classic spinach, mushroom, and feta combination, but the quantities and method below are written as an original recipe for a rich, savory quiche.

Spinach Mushroom Quiche at a Glance

Ingredients

You do not need a long list of ingredients to make a good quiche. The mushrooms and spinach provide most of the flavor, while the eggs and dairy create the soft, creamy filling.

For the Quiche

• 1 refrigerated 9-inch pie crust, unbaked
• 1 tablespoon butter or olive oil
• 8 ounces mushrooms, thinly sliced
• 2 cups fresh spinach, roughly chopped
• 2 cloves garlic, minced
• 2 tablespoons finely chopped onion
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 4 large eggs
• 3/4 cup milk or half-and-half
• 1/2 cup crumbled feta cheese
• 1/2 cup shredded mozzarella cheese
• 1/4 teaspoon dried thyme

Also Read: Stuffed Mushroom Recipe

How to Make Spinach Mushroom Quiche

1. Prepare the Oven and Crust

Preheat your oven to 350°F (175°C). Place the refrigerated pie crust into a 9-inch pie dish and gently press it into the bottom and sides. Tuck or crimp the edges as desired. Keep the crust aside while you prepare the filling.

2. Cook the Mushrooms

Heat the butter or olive oil in a large skillet over medium heat. Add the sliced mushrooms and cook for about 5–7 minutes, stirring occasionally. The mushrooms will release quite a bit of water at first, so continue cooking until most of that moisture has evaporated.

3. Add the Spinach and Aromatics

Add the chopped onion and garlic to the skillet and cook for another 1–2 minutes. Add the spinach, salt, pepper, and thyme. Stir until the spinach wilts and the vegetables are tender. Remove the skillet from the heat and let the mixture cool for a few minutes.

4. Make the Egg Filling

In a medium bowl, whisk the eggs and milk or half-and-half until smooth. Stir in the shredded mozzarella and crumbled feta. Taste the cooked vegetables before adding more salt because feta can already be quite salty.

5. Fill the Crust

Spread the cooked spinach and mushroom mixture evenly over the pie crust. Pour the egg and cheese mixture over the vegetables, making sure it reaches the edges. Gently shake the pie dish so the filling settles into the spaces between the vegetables.

6. Bake

Place the quiche on a baking sheet and bake for 45–50 minutes, or until the edges are lightly golden and the center is set with only a slight jiggle. If the crust starts browning too quickly, loosely cover the edges with foil.

7. Rest Before Slicing

Remove the quiche from the oven and let it rest for about 10 minutes before slicing. This gives the egg filling time to finish setting and makes the slices much easier to serve.

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What You Can Do Better

The easiest way to improve this quiche is to take your time with the mushrooms. Do not rush them or add the eggs while there is still a pool of liquid in the skillet. Mushrooms naturally release water as they cook, and that extra moisture can make the quiche softer than you want. Cooking them until the pan is mostly dry gives the filling a deeper flavor and better texture.

Fresh spinach also works particularly well, but frozen spinach can be used when that is what you have available. If using frozen spinach, thaw it completely and squeeze out as much water as possible before adding it to the skillet. For a stronger cheese flavor, replace some of the mozzarella with additional feta or shredded Swiss cheese.

Tips for a Better Spinach Mushroom Quiche

• Cook the mushrooms properly: Let them release their moisture before adding the egg mixture.
• Do not overload the crust: Too many vegetables can make the center take much longer to set.
• Use room-temperature eggs: They blend more easily with the dairy and help create an even filling.
• Watch the salt: Feta already brings a salty, tangy flavor, so taste before adding extra seasoning.
• Let it rest: Cutting the quiche immediately after baking can cause the filling to fall apart.

Can You Use Frozen Spinach?

Yes. Frozen spinach is a convenient substitute for fresh spinach in this recipe. Thaw it completely and squeeze it firmly to remove excess water before mixing it with the mushrooms. This is especially important for quiche because extra liquid can prevent the egg custard from setting properly.

Also Read: Chicken Bacon Ranch Pasta

Can You Make Spinach Mushroom Quiche Ahead of Time?

Absolutely. You can bake the quiche a day ahead and refrigerate it once it has cooled. When you are ready to serve, warm individual slices in the microwave or reheat the whole quiche in a 325°F (165°C) oven until heated through. It is also good served slightly warm or at room temperature.

How to Store Leftover Quiche

Allow leftover quiche to cool before covering it and placing it in the refrigerator. It should keep well for about 3–4 days. For the best texture, reheat slices in the oven or toaster oven rather than overheating them in the microwave.

Serving Ideas

A slice of spinach mushroom quiche is filling enough to stand on its own, but a few simple sides can turn it into a complete meal. Serve it with a green salad, fresh fruit, roasted potatoes, or sliced tomatoes. For brunch, it also pairs nicely with fresh berries and a cup of coffee.

Also Read: Egg White Frittata

Nutritional Information

The following nutrition information is an estimate based on the ingredients listed and assumes the quiche is divided into 8 servings. Actual values will vary depending on the pie crust, cheese, milk, and portion size used.

Also Read: Creamy Chicken Noodle Soup

Frequently Asked Questions

Can I make this quiche without feta?

Yes. You can replace the feta with cheddar, Swiss, Gruyere, or more mozzarella. Each cheese will give the quiche a slightly different flavor.

Why is my quiche watery?

The most common reason is excess moisture from the vegetables. Cook the mushrooms until their liquid has evaporated and squeeze thawed frozen spinach very well before using it.

Can I make this quiche crustless?

Yes. Grease a 9-inch pie dish well and pour the vegetable and egg mixture directly into it. A crustless version will usually need around 35–45 minutes at 350°F, depending on the depth of the dish.

How do I know when the quiche is done?

The edges should look set and lightly golden, while the center should have only a gentle jiggle. The filling will continue to firm up as the quiche rests after coming out of the oven.