This Spinach & Feta Crustless Mushroom Quiche is a cozy, savory bake filled with tender mushrooms, wilted spinach, creamy feta, and fluffy eggs. The mushrooms add earthy richness, while feta brings a salty, tangy bite and beautiful creamy pockets throughout. With no pastry crust, it is naturally low-carb and protein-rich, making it a satisfying choice for breakfast, brunch, meal prep, or a light dinner.

Short 3-Line Description

A golden, crustless quiche loaded with spinach, mushrooms, eggs, and tangy feta.
Soft and creamy inside with beautifully browned mushrooms on top.
A delicious low-carb, high-protein breakfast or meal-prep option.

Can This Spinach & Feta Crustless Mushroom Quiche Support Weight Loss Goals?

Yes, this quiche can fit comfortably into a balanced weight-loss eating pattern. Eggs, feta, and Greek yogurt provide protein that can make a serving satisfying, while spinach and mushrooms add volume and nutrients without contributing many carbohydrates.

Because cheese and eggs are relatively calorie-dense, portion size still matters. Pairing one serving with fresh vegetables or a salad can create a filling meal without relying on a large amount of bread or other high-carb sides.

Does Spinach & Feta Crustless Mushroom Quiche Fit a High-Protein Lifestyle?

Yes, this quiche is a particularly convenient high-protein, low-carb meal. It uses eggs, feta, and Greek yogurt as its primary protein sources, with spinach and mushrooms adding flavor and texture. Each serving contains approximately 19 g protein and 5 g net carbs, depending on the specific brands used. It works well as a protein-rich breakfast, lunch, dinner, or meal-prep option.

Why This Recipe Is Special

Crustless & keto-friendly — Skipping pastry dramatically reduces the carbohydrate load.
Protein-rich — Eggs, feta, and Greek yogurt give the quiche a satisfying protein boost.
Vegetable-packed — Spinach and mushrooms add savory flavor, color, and texture.
One-dish comfort food — Everything bakes together in one simple dish.
Meal-prep friendly — It slices beautifully and reheats well throughout the week.

My Personal Experience

The mushrooms make every bite extra savory.
Browning them first gives them a deeper, almost meaty flavor that works beautifully with feta.
I love the creamy center.
The Greek yogurt makes the egg mixture tender and soft without needing heavy cream.
The feta adds just the right amount of saltiness.
Little pockets of feta throughout the quiche give each slice a delicious tangy contrast.
It feels much more indulgent than it actually is.
The golden surface and creamy interior make this feel like classic brunch comfort food without a pastry crust.
It is excellent for leftovers.
A chilled slice can quickly become an easy breakfast or lunch with a simple salad on the side.

Perfect For

This quiche is ideal for weekend brunches, busy weekday breakfasts, meal prep, light lunches, vegetarian dinners, low-carb meal plans, and keto-friendly menus. It can also be served as a savory snack when cut into smaller squares or wedges.

Why You’ll Love This Recipe

No crust to fuss with.
There is no rolling, chilling, or blind-baking pastry, making this much easier than traditional quiche.
Golden and creamy.
The top becomes lightly browned while the center stays tender and custardy.
Loaded with vegetables.
Spinach and mushrooms provide plenty of savory texture without overpowering the eggs.
Naturally low in carbs.
The recipe skips flour and pastry, keeping the net-carb count relatively low.
Great for meal prep.
Individual slices can be refrigerated or frozen and reheated whenever you need them.

Common Mistakes to Avoid

Adding wet spinach: Excess water can make the quiche watery; squeeze thawed frozen spinach very thoroughly or wilt fresh spinach and cook off excess moisture.
Skipping mushroom browning: Raw mushrooms release water during baking, so sauté them first until nicely browned.
Overbaking: The center should have a slight gentle jiggle when removed; it will continue setting as it cools.
Using too much salt: Feta is naturally salty, so taste the egg mixture before adding additional salt.

Required Equipment

9-inch pie dish — gives the quiche a consistent thickness for even baking.
Large mixing bowl — provides enough room to whisk the custard thoroughly.
Large skillet — allows mushrooms and spinach to release excess moisture before baking.
Whisk — creates a smooth, evenly distributed egg mixture.
Sharp knife — makes clean wedges once the quiche has rested.

Storage Instructions

Refrigerator: Cool completely and store individual slices in an airtight container for up to 4 days.
Best container: Use a shallow airtight container and place parchment between stacked slices to prevent sticking.
Freezer: Wrap individual cooled portions tightly in plastic wrap or freezer paper and place them in a freezer-safe bag or container for up to 2 months.
Refrigerated reheating: Warm at 325°F (165°C) for 8–12 minutes, or microwave gently until heated through.
Frozen reheating: Thaw overnight in the refrigerator before reheating for the best texture.
The protein content remains essentially the same after refrigeration or freezing, although texture may become slightly softer after freezing.

Recipe Details

Preparation Time: 15 minutes
Cooking Time: 35–40 minutes
Total Time: 50–55 minutes
Servings: 6
Best Season: All-season
Total Calories: Approximately 230 calories per serving

📝 Ingredients

For the quiche

8 large eggs
½ cup (120 g) plain nonfat Greek yogurt — adds protein and creates a creamy texture
1 cup (150 g) crumbled feta cheese
8 oz (225 g) mushrooms, sliced
5 oz (140 g) fresh baby spinach
½ cup (50 g) shredded mozzarella cheese
1 tablespoon olive oil
2 cloves garlic, minced
½ teaspoon dried oregano
½ teaspoon dried Italian seasoning
¼ teaspoon black pepper
¼ teaspoon salt — optional; feta may provide enough salt

Optional garnish

1 tablespoon chopped fresh parsley
Pinch of red pepper flakes

Directions

1. Preheat the oven

Heat the oven to 375°F (190°C).

Lightly grease a 9-inch pie dish with a little olive oil or nonstick spray.

2. Brown the mushrooms

Heat 1 tablespoon olive oil in a large skillet over medium-high heat.

Add the sliced mushrooms and cook for 6–8 minutes, stirring occasionally, until they are browned and most of their moisture has evaporated.

Visual cue: The mushrooms should look golden-brown rather than pale and watery.

3. Add the garlic and spinach

Reduce the heat to medium. Add minced garlic and cook for 30 seconds.

Add the spinach and cook for 1–2 minutes, just until wilted.

Remove from the heat and allow the vegetables to cool slightly.

High-protein cooking tip: Don’t add extra cream to compensate for dryness; the Greek yogurt provides creaminess while keeping the recipe protein-friendly.

4. Prepare the custard

In a large bowl, whisk together the eggs, Greek yogurt, oregano, Italian seasoning, black pepper, and optional salt until smooth.

Whisking thoroughly helps distribute the yogurt evenly for a creamy texture.

5. Combine the filling

Stir the sautéed mushrooms and spinach into the egg mixture.

Fold in approximately ¾ cup of the feta and all of the mozzarella, reserving the remaining feta for the top.

6. Fill the baking dish

Pour the mixture into the prepared pie dish.

Scatter the remaining feta over the surface and add a few extra mushrooms or spinach leaves if desired.

7. Bake

Bake at 375°F (190°C) for 35–40 minutes.

The edges should be set and lightly golden, while the center should have a very slight jiggle when gently shaken.

8. Rest before slicing

Remove from the oven and let the quiche rest for 10 minutes.

This allows the custard to finish setting and makes the slices much easier to cut.

Garnish with parsley and red pepper flakes if desired, then serve warm.

Nutrition Facts

Per Serving – Approximate

Nutrient	Amount
Calories	~230 kcal
Fat	~15 g
Cholesterol	~255 mg
Sodium	~570 mg
Potassium	~300 mg
Total Carbohydrates	~6 g
Fiber	~1 g
Net Carbs	~5 g
Sugars	~3 g
Protein	~19 g
Calcium	~300 mg

These figures are approximate estimates. Actual nutrition will vary according to egg size and the brands and varieties of feta, mozzarella, and Greek yogurt used.

Notes

Storage: Refrigerate leftovers for up to 4 days or freeze individual portions for up to 2 months.
Reheating: Oven or air fryer reheating gives the best texture; microwave in short intervals to prevent the eggs from becoming rubbery.
Allergy notes: Contains eggs and dairy. Feta and Greek yogurt are both dairy ingredients.
For extra flavor: Add fresh dill, parsley, chives, or a pinch of smoked paprika.
For more protein: Serve with a side of cottage cheese or plain Greek yogurt, or add diced cooked chicken to the filling.
For extra vegetables: Bell peppers or finely chopped zucchini can be added, but cook them first to remove excess moisture.
For a richer quiche: Replace part of the Greek yogurt with full-fat Greek yogurt, keeping in mind that calories will increase.

Frequently Asked Questions

1. Can I make this quiche without Greek yogurt?
Yes, you can substitute an equal amount of cottage cheese blended until smooth or use heavy cream, although the protein and calorie content will change.

2. Can I use frozen spinach?
Yes, but thaw it completely and squeeze out as much water as possible before adding it.

3. Can I prepare this quiche ahead of time?
Yes, bake it up to 4 days ahead and refrigerate the cooled quiche until ready to serve.

4. Is this quiche keto-friendly?
It can fit many keto meal plans because it contains approximately 5 g net carbs per serving, depending on the ingredients used.

5. Can I add meat to this recipe?
Yes, cooked turkey, chicken, ham, or bacon can be added, although this will change the nutrition values.

6. Why is my crustless quiche watery?
The most common causes are excess moisture from mushrooms or spinach and undercooking, so sauté the vegetables thoroughly and bake until the center is just set.

🥬 Spinach & Feta Crustless Mushroom Quiche