Spinach, Mushroom & Cheese Crustless Quiche
Description
This Spinach, Mushroom & Cheese Crustless Quiche is a deliciously fluffy, savory egg bake loaded with tender spinach, earthy mushrooms, fresh green onions, colorful vegetables, and plenty of melted cheese. Baked until beautifully golden on top and soft and creamy in the center, this comforting dish is perfect for breakfast, brunch, lunch, or a light dinner.
The beauty of this recipe is that it delivers all the satisfying flavors of a traditional quiche without the pastry crust. That makes it easier to prepare and allows the vegetables, eggs, and cheese to become the stars of the dish. The top develops a gorgeous golden-brown finish while the inside stays tender and flavorful.
This recipe is also extremely flexible. You can use mushrooms, spinach, bell peppers, green onions, zucchini, tomatoes, or other vegetables you have available. Cheddar, mozzarella, Monterey Jack, Swiss, feta, or Parmesan can be used individually or combined for extra flavor.
It is an excellent make-ahead recipe because slices can be refrigerated and reheated throughout the week. Serve it warm with a fresh green salad, roasted vegetables, fruit, or toasted bread for a complete and satisfying meal.
Recipe Details
Prep Time: 20 minutes
Cook Time: 40–50 minutes
Total Time: About 1 hour
Servings: 8
Course: Breakfast, Brunch, Lunch or Dinner
Cuisine: American-inspired
Difficulty: Easy
Ingredients
For the Egg Mixture
- 8 large eggs
- 1 cup whole milk
- ½ cup heavy cream
- 1 cup shredded cheddar cheese
- ½ cup shredded mozzarella cheese
- ¼ cup grated Parmesan cheese
- ½ teaspoon salt
- ½ teaspoon black pepper
- ½ teaspoon garlic powder
- ½ teaspoon Italian seasoning
- ¼ teaspoon paprika
- ¼ teaspoon onion powder
For the Vegetables
- 2 cups fresh spinach, roughly chopped
- 8 ounces mushrooms, thinly sliced
- 3 green onions, sliced
- ½ small red bell pepper, diced
- ½ small yellow or green bell pepper, diced
- 2 garlic cloves, minced
- 1 tablespoon olive oil
- ½ teaspoon salt
- ¼ teaspoon black pepper
For the Top
- ½ cup shredded mozzarella or cheddar
- 2 tablespoons grated Parmesan
- 1 tablespoon chopped fresh parsley
- Optional: extra sliced green onions
Choosing the Right Vegetables
The vegetables are an important part of this recipe because they provide flavor, color, texture, and moisture.
Fresh spinach works particularly well because it wilts quickly and blends beautifully with eggs and cheese. Mushrooms provide an earthy, savory flavor that makes the quiche feel hearty and substantial.
Green onions add a mild onion flavor without overpowering the other ingredients. Bell peppers bring natural sweetness and attractive color.
You can also add zucchini, broccoli, asparagus, tomatoes, or cooked onions.
However, vegetables contain water, and too much moisture can prevent the egg mixture from setting properly. For that reason, vegetables should be cooked before being added to the eggs.
Preparing the Vegetables
Begin by washing the spinach thoroughly and drying it as much as possible.
Clean the mushrooms and slice them thinly.
Dice the bell peppers into small, evenly sized pieces.
Slice the green onions and separate some of the green tops for garnish if desired.
Mince the garlic.
Heat 1 tablespoon of olive oil in a large skillet over medium-high heat.
Add the sliced mushrooms.
Cook for approximately 5–7 minutes, stirring occasionally.
At first, the mushrooms will release quite a bit of moisture. Continue cooking until most of the liquid evaporates and the mushrooms begin to turn golden.
This step is important because it concentrates their flavor and prevents excess moisture from ending up in the quiche.
Add the diced bell peppers and cook for another 2–3 minutes.
Add the minced garlic and cook for about 30 seconds.
Finally, add the chopped spinach.
Cook for 1–2 minutes, stirring frequently, until the spinach wilts.
Season lightly with salt and black pepper.
Remove the skillet from the heat.
If the vegetable mixture looks particularly moist, transfer it to a plate lined with paper towels and allow it to cool slightly
Why Cooking the Vegetables First Matters
It may be tempting to add raw vegetables directly to the egg mixture, but cooking them first produces a much better result.
Mushrooms release water as they cook. Spinach also contains a considerable amount of moisture. Bell peppers and onions contribute additional liquid.
If all of these vegetables are added raw, that moisture can collect inside the baking dish and create a watery quiche.
Sautéing the vegetables first removes excess moisture and gives them a deeper, more concentrated flavor.
It also ensures that the vegetables become perfectly tender by the time the eggs are fully cooked.
Preparing the Egg Mixture
While the vegetables cool slightly, preheat your oven to 375°F (190°C).
Lightly grease a deep 9-inch pie dish, 10-inch quiche dish, or similar baking dish with butter or nonstick cooking spray.
Crack the eggs into a large mixing bowl.
Add the whole milk and heavy cream.
Whisk until the eggs and dairy are fully combined.
Add salt, black pepper, garlic powder, Italian seasoning, paprika, and onion powder.
Whisk again.
Add 1 cup shredded cheddar, ½ cup mozzarella, and ¼ cup Parmesan.
Stir gently to distribute the cheese evenly.
The mixture should look creamy and well combined.
For an even richer quiche, you can replace some of the milk with additional cream.
For a lighter version, use all milk instead of cream.
Combining the Filling
Allow the cooked vegetables to cool for several minutes.
This is important because adding extremely hot vegetables directly to the eggs can begin cooking the egg mixture prematurely.
Add the sautéed mushrooms, spinach, peppers, garlic, and green onions to the egg mixture.
Stir gently until the vegetables are evenly distributed.
At this stage, taste a tiny amount of the mixture if desired and adjust the seasoning.
Remember that the cheese will add additional saltiness, so avoid oversaltin
Preparing the Baking Dish
Grease the baking dish thoroughly.
For an especially easy cleanup, you can also line the bottom with parchment paper, although this is optional.
Pour the egg and vegetable mixture into the prepared dish.
Use a spatula to distribute the vegetables evenly.
Sprinkle the remaining mozzarella or cheddar over the surface.
Finish with the grated Parmesan.
The cheese topping is what helps create the beautiful golden crust seen on top of the baked dish.
Baking the Quiche
Place the baking dish in the center of the preheated oven.
Bake uncovered for approximately 40–50 minutes.
The exact cooking time will depend on the depth and size of your baking dish.
The quiche is ready when the edges are firm, the center is mostly set, and the top is golden brown.
A slight movement in the center is normal when the dish first comes out of the oven. It should not look liquid or excessively loose.
If the top begins browning too quickly while the center still needs more time, loosely cover the dish with aluminum foil.
Continue baking until fully set.
For food safety, the center should reach approximately 160°F (71°C).
Resting the Quiche
Do not slice the quiche immediately after removing it from the oven.
Allow it to rest for approximately 10–15 minutes.
During this time, the eggs will finish setting and the melted cheese will stabilize.
Resting also makes it much easier to cut clean, attractive slices.
Sprinkle the top with fresh parsley and reserved green onion before serving.
Tips for the Perfect Crustless Quiche
1. Cook the Mushrooms Properly
Don’t rush the mushrooms.
Allow them enough time to release their moisture and become lightly browned. This creates a richer flavor and helps prevent a watery quiche.
2. Squeeze Wet Spinach
If you use frozen spinach instead of fresh, thaw it completely and squeeze out as much liquid as possible.
Excess water is one of the most common causes of watery egg bakes.
3. Don’t Overfill the Dish
Leave a little room at the top of the baking dish because the eggs will puff slightly during baking.
4. Use Good-Quality Cheese
Freshly shredded cheese generally melts more smoothly than packaged pre-shredded cheese.
5. Don’t Overbake
Overbaking can cause the eggs to become rubbery.
Remove the quiche when the center is just set.
6. Let It Rest
A short resting period makes a big difference in texture.
Cheese Variations
This recipe works with many different cheeses.
Cheddar
Sharp cheddar gives the quiche a classic savory flavor and beautiful color.
Mozzarella
Mozzarella creates a soft, stretchy texture and mild flavor.
Swiss Cheese
Swiss cheese adds a slightly nutty flavor that pairs especially well with mushrooms.
Feta
Feta gives the recipe a salty Mediterranean-style flavor.
Goat Cheese
Soft goat cheese creates a creamy, tangy filling.
Monterey Jack
Monterey Jack melts beautifully and creates a mild, creamy flavor.
Parmesan
Parmesan adds concentrated salty, nutty flavor and helps the top brown beautifully.
For the best results, combine two or three cheeses.
Vegetable Variations
One of the best things about this recipe is how easily it can be customized.
Try adding:
- Zucchini
- Broccoli
- Asparagus
- Roasted red peppers
- Cherry tomatoes
- Caramelized onions
- Corn
- Kale
- Artichoke hearts
- Sun-dried tomatoes
If using tomatoes, remove excess seeds and moisture when possible.
If using broccoli or asparagus, lightly steam or sauté them before adding them to the egg mixture.
Protein Variations
The recipe is delicious as a vegetarian dish, but you can also add cooked protein.
Bacon
Cooked, crumbled bacon adds smoky, salty flavor.
Sausage
Cooked breakfast sausage creates a hearty breakfast casserole.
Ham
Diced cooked ham works particularly well with spinach and cheese.
Chicken
Chopped cooked chicken transforms the dish into a satisfying lunch or dinner.
Turkey
Cooked turkey is especially useful after holidays when leftovers are available.
Always cook meat completely before adding it to the egg mixture.
Mediterranean-Inspired Version
For a Mediterranean twist, replace some of the cheddar with feta cheese.
Add chopped Kalamata olives, sun-dried tomatoes, spinach, red onion, and fresh oregano.
You can also add a small amount of crumbled feta to the top before baking.
Serve with a tomato cucumber salad dressed with lemon juice and olive oil.
The combination of spinach, mushrooms, feta, herbs, and vegetables makes a particularly flavorful version.
How to Serve
This crustless quiche is incredibly versatile.
For breakfast, serve it with fresh fruit, avocado, or roasted potatoes.
For brunch, pair it with a simple green salad and fresh berries.
For lunch, serve a warm slice alongside tomato cucumber salad.
For dinner, add roasted vegetables, steamed broccoli, or a crisp side salad.
You can also serve it with:
- Avocado slices
- Fresh tomatoes
- Toasted bread
- Roasted potatoes
- Mixed green salad
- Fresh fruit
- Sautéed vegetables
- Greek yogurt
- Salsa
A small spoonful of sour cream or Greek yogurt on the side is also delicious.
Make-Ahead Instructions
This recipe is excellent for making ahead.
Prepare the entire quiche according to the recipe and allow it to cool completely.
Cover it tightly and refrigerate.
When ready to serve, gently reheat individual slices in the microwave or warm the entire dish in a 325°F oven.
If reheating the whole quiche, cover it loosely with foil to prevent the top from becoming too dark.
You can also prepare the vegetable mixture one day ahead and refrigerate it.
The next day, prepare the egg mixture, combine everything, and bake.
Meal Prep Instructions
Cut the cooled quiche into 8 portions.
Place individual slices into airtight containers.
Store them in the refrigerator and reheat portions as needed.
Pair a slice with fresh fruit for breakfast or a green salad for lunch.
The recipe works particularly well for busy mornings because it can be prepared once and enjoyed for several days.
Storage
Store leftover quiche in an airtight container in the refrigerator.
It will generally keep well for 3–4 days.
Allow the quiche to cool before refrigerating.
For best texture, reheat gently rather than at very high heat.
Microwave individual portions in short intervals until warmed through.
Alternatively, place a slice in a 325°F oven for approximately 10–15 minutes.
Can You Freeze Crustless Quiche?
Yes, this quiche can be frozen.
Allow it to cool completely before freezing.
You can freeze the entire quiche or cut it into individual portions.
Wrap each portion tightly in plastic wrap and place it inside a freezer-safe container or bag.
Freeze for up to approximately 2–3 months.
Thaw overnight in the refrigerator.
Reheat in a moderate oven until hot.
The texture may be slightly different after freezing because eggs and vegetables can release some moisture, but it remains a convenient make-ahead option.
Nutritional Information
Nutrition will vary depending on the cheese, milk, cream, and vegetables used.
Approximate nutrition per serving:
Calories: 300–350
Protein: 20–24g
Carbohydrates: 7–10g
Fiber: 1–2g
Fat: 21–25g
Saturated Fat: 9–12g
Sugar: 3–4g
Sodium: 500–700mg
Calcium: Approximately 250–350mg
Using reduced-fat cheese and milk can lower the calorie and fat content.
Adding more vegetables can increase the fiber and nutrient content without significantly increasing calories.
Benefits of This Recipe
Protein-Rich
Eggs and cheese provide protein that helps make this dish filling and satisfying.
Vegetable-Focused
Spinach, mushrooms, peppers, and green onions contribute flavor, color, fiber, vitamins, and minerals.
No Pastry Crust
Skipping the traditional crust makes this recipe easier to prepare and naturally reduces the amount of refined flour.
Versatile
You can easily change the vegetables, cheese, herbs, and protein according to what you have available.
Meal-Prep Friendly
The baked quiche stores and reheats well, making it practical for busy households.
Family-Friendly
The mild flavors and creamy cheesy texture make vegetables more appealing to both adults and children.
Frequently Asked Questions
Can I use frozen spinach?
Yes.
Thaw the spinach completely and squeeze out as much water as possible before using it.
Can I use only milk?
Yes.
Replace the heavy cream with additional whole milk for a lighter version.
The finished quiche will still be delicious but slightly less rich.
Why is my quiche watery?
The most common reason is excess moisture from vegetables.
Make sure mushrooms are cooked until their moisture evaporates and spinach is thoroughly drained.
Tomatoes and zucchini should also be cooked or drained before being added.
Can I make this without mushrooms?
Absolutely.
Simply replace the mushrooms with another vegetable such as zucchini, broccoli, peppers, or additional spinach.
Can I add meat?
Yes.
Cooked bacon, sausage, ham, chicken, or turkey can be added.
Can I use cottage cheese?
Yes.
Cottage cheese can make the filling extra creamy and add protein.
Blend it slightly if you prefer a smoother texture.
Can I use a different baking dish?
Yes.
A 9-inch pie dish, 10-inch quiche dish, square baking dish, or similar oven-safe dish can work.
Remember that deeper dishes may require additional baking time.
How do I know when it is done?
The edges should be firm, the center should be set but slightly tender, and the top should be golden.
A thermometer should register approximately 160°F in the center.