If you are searching for a dish that combines rich flavors, creamy textures, and a hint of savory sweetness, look no further than this Caramelised Onion, Feta & Spinach Quiche Recipe. This delightful quiche brings together the deep, golden caramelised onions with tangy feta and fresh spinach, all embraced in a flaky pie crust. Whether you’re planning a cozy brunch, a light dinner, or an impressive potluck contribution, this dish delivers a comforting yet elegant experience that’s sure to become one of your favorites.

Ingredients You’ll Need
Gathering the right ingredients is key, but the beauty of this Caramelised Onion, Feta & Spinach Quiche Recipe lies in its simplicity. Each component plays a special role—from the buttery crust providing a crisp base to the creamy filling that beautifully balances savory and sweet notes.
- Pie crust: Choose either store-bought for convenience or homemade for extra flakiness and buttery flavor.
- Olive oil: Adds richness and helps caramelise the onions evenly.
- Large onions: Thinly sliced to ensure they cook down into silky, golden caramelised pieces.
- Sugar: Helps bring out the natural sweetness of the onions during caramelisation.
- Salt: Enhances all the flavors, especially the sweet and savory elements.
- Large eggs: The binding agent that creates that luscious quiche texture.
- Heavy cream: Adds creaminess and richness to the egg mixture, making every bite smooth.
- Fresh spinach: Provides a vibrant color contrast and a gentle earthy taste.
- Feta cheese: Crumbled feta delivers a delightful tang and crumbly texture that pairs perfectly with the sweet onions.
- Black pepper: Adds subtle warmth and complexity.
- Nutmeg: Just a pinch to elevate the creamy filling with a subtle, nutty aroma.
- Shredded mozzarella cheese (optional): For a melty, golden topping that adds another layer of flavor.
How to Make Caramelised Onion, Feta & Spinach Quiche Recipe
Step 1: Prepare the crust
Begin by preheating your oven to 375°F. Fit your pie crust into a 9-inch pie dish and prick the bottom with a fork to avoid bubbling. Pre-bake the crust for about 10 minutes until it’s lightly set and just starting to turn golden. This step is crucial to keep your crust crisp once the filling is added.
Step 2: Caramelise the onions
Heat 2 tablespoons of olive oil in a large skillet over medium heat. Add the thinly sliced onions along with 1 teaspoon of sugar and ½ teaspoon of salt. Stir occasionally and cook for 20 to 25 minutes until the onions are beautifully caramelised, turning soft and golden brown. This slow cooking unlocks the sweet, rich notes that make this quiche truly special.
Step 3: Whisk the filling
In a medium bowl, whisk together 4 large eggs, 1 cup of heavy cream, ½ teaspoon black pepper, and ¼ teaspoon nutmeg until fully combined. This creamy base will carry all the flavors together and set into a silky custard once baked.
Step 4: Combine the ingredients
Fold the cooked caramelised onions, 1 cup of chopped fresh spinach, and 1 cup of crumbled feta cheese into the egg mixture. These ingredients bring a balanced medley of textures and tastes—sweet, tangy, and fresh—that make every forkful delightful.
Step 5: Bake the quiche
Pour the filling into the pre-baked crust. If you love extra cheesiness, sprinkle ½ cup of shredded mozzarella cheese on top. Bake in the oven for 30 to 35 minutes until the quiche is just set and the top is lightly golden. Once baked, let it rest for about 10 minutes to firm up, making it easier to slice and savor.
How to Serve Caramelised Onion, Feta & Spinach Quiche Recipe

Garnishes
A sprinkle of freshly chopped parsley or chives adds a bright, fresh note and a pop of green color that makes the Caramelised Onion, Feta & Spinach Quiche Recipe inviting and gorgeous on the plate.
Side Dishes
This quiche pairs wonderfully with a crisp mixed green salad tossed in a light vinaigrette, fresh cherry tomatoes, or a citrusy arugula side. These sides offer a refreshing contrast to the richness and make your meal feel balanced and wholesome.
Creative Ways to Present
For brunch or a finger-food party, consider cutting the quiche into small squares or wedges. Serve alongside dollops of tangy Greek yogurt or a drizzle of honey mustard for an exciting flavor twist. You can also make individual mini quiches using muffin tins for an adorable, shareable presentation.
Make Ahead and Storage
Storing Leftovers
Leftover Caramelised Onion, Feta & Spinach Quiche Recipe can be kept in an airtight container in the refrigerator for up to 3 days. This makes it a perfect next-day breakfast or quick lunch option.
Freezing
You can freeze slices of the quiche by wrapping them tightly in plastic wrap and placing them inside a freezer-safe bag. Frozen quiche stays delicious for up to 2 months, allowing you to prep ahead for busy days.
Reheating
Reheat your quiche slices in a preheated oven at 350°F for 10-15 minutes or until warmed through and slightly crisped on top. Avoid microwaving if possible, as reheating in the oven maintains the flaky crust and creamy filling texture beautifully.
FAQs
Can I use a different cheese instead of feta?
Absolutely! While feta contributes a salty tang that pairs perfectly with caramelised onions and spinach, goat cheese or ricotta can be wonderful substitutes that will offer a creamy texture and mild flavor.
Is it possible to make this quiche dairy-free?
Yes, you can swap the heavy cream for a full-fat coconut milk or a dairy-free cream alternative. For the cheese, try a plant-based feta or simply omit it and add some nutritional yeast for cheesy flavor.
How do I know when the quiche is fully cooked?
The quiche is done when the edges are set and the center no longer jiggles when you gently shake the pan. The top should be lightly golden, indicating that it has baked through properly.
Can I prepare the caramelised onions in advance?
Definitely! Caramelised onions can be made a day or two ahead and stored in the refrigerator. This can help save time on the day you plan to bake your quiche, making the process smoother.
What is the best crust to use for this quiche?
A classic buttery pie crust is ideal because it holds up well to the moist filling and creates a deliciously flaky base. However, if you prefer, you can also use a savory pastry crust or even a gluten-free option to suit dietary needs.
Final Thoughts
There is something truly special about the Caramelised Onion, Feta & Spinach Quiche Recipe that makes it perfect for so many occasions. Whether you’re feeding family, entertaining friends, or simply treating yourself, this quiche combines fantastic flavors and textures with comforting ease. Give it a try—you might just find your new go-to recipe for any time of day.
Print
Caramelised Onion, Feta & Spinach Quiche Recipe
- Prep Time: 15 minutes
- Cook Time: 55 minutes
- Total Time: 1 hour 10 minutes
- Yield: 6 servings
- Category: Quiche
- Method: Baking
- Cuisine: Western
- Diet: Vegetarian
Description
This Caramelised Onion, Feta & Spinach Quiche is a savory, flavorful dish combining sweet caramelized onions, tangy feta cheese, and fresh spinach in a creamy egg custard baked in a flaky pie crust. Perfect for brunch, lunch, or a light dinner, this quiche offers a delightful balance of textures and tastes with a golden, cheesy top.
Ingredients
Pie Crust
- 1 pie crust (store-bought or homemade)
Filling
- 2 tablespoons olive oil
- 2 large onions, thinly sliced
- 1 teaspoon sugar
- 1/2 teaspoon salt
- 4 large eggs
- 1 cup heavy cream
- 1 cup fresh spinach, chopped
- 1 cup feta cheese, crumbled
- 1/2 teaspoon black pepper
- 1/4 teaspoon nutmeg
- 1/2 cup shredded mozzarella cheese (optional)
Instructions
- Preheat Oven: Preheat your oven to 375°F (190°C) to prepare for baking the quiche.
- Prepare Pie Crust: If using a store-bought pie crust, fit it neatly into a 9-inch pie dish, then prick the bottom of the crust with a fork to prevent bubbling during baking.
- Pre-Bake Crust: Bake the crust in the preheated oven for 10 minutes to partially cook it, then remove and set aside.
- Caramelize Onions: Heat olive oil in a large skillet over medium heat. Add the thinly sliced onions, sugar, and salt. Cook, stirring occasionally, for 20-25 minutes until the onions turn golden brown and are fully caramelized.
- Cool Onions: Remove the skillet from heat and allow the caramelized onions to cool slightly before mixing with other ingredients.
- Mix Egg Custard: In a mixing bowl, whisk together the eggs, heavy cream, black pepper, and nutmeg until smooth and well combined.
- Add Spinach and Feta: Stir the chopped fresh spinach and crumbled feta cheese into the egg mixture evenly.
- Combine Onions with Custard: Fold the cooled caramelized onions into the egg, spinach, and feta mixture, ensuring everything is well mixed.
- Fill Pie Crust: Pour the prepared filling into the pre-baked pie crust, spreading it evenly.
- Add Mozzarella (Optional): If using, sprinkle the shredded mozzarella cheese evenly on top of the filling for added flavor and browning.
- Bake Quiche: Place the filled pie dish in the oven and bake for 30-35 minutes, or until the quiche is set in the center and lightly golden on top.
- Cool and Serve: Remove the quiche from the oven and allow it to cool for about 10 minutes before slicing. Serve warm or at room temperature for best flavor.
Notes
- For the best results, use fresh spinach and good quality feta cheese.
- You can prepare the caramelized onions a day ahead and refrigerate to save time.
- If you want a dairy-free version, substitute heavy cream with coconut cream and omit the cheeses.
- Ensure the pie crust is not overbaked during pre-baking to avoid dryness.
- Leftovers can be refrigerated and reheated in the oven for a freshly baked taste.

