Caramelized Onion and Spinach Quiche

Name: Caramelized Onion and Spinach Quiche
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Yield: 8 servings
Ingredients: 1 1/4 cups all-purpose flour; 1/2 cup unsalted butter, chilled and cubed; 1/4 teaspoon salt; 3-4 tablespoons cold water; 2 tablespoons olive oil; 2 large onions, thinly sliced; 4 cups fresh spinach, chopped; 4 large eggs; 1 cup heavy cream; 1 cup shredded cheese (e.g., Gruyère or cheddar); Salt and pepper to taste

Highlighted under: Homestyle Recipe Favorites

I absolutely love making this Caramelized Onion and Spinach Quiche, especially for brunch gatherings. The combination of sweet, caramelized onions and fresh spinach creates an irresistible flavor that keeps everyone coming back for more. I’ve perfected this recipe over time, adapting the cooking process to achieve the flakiest crust and a wonderfully creamy filling. The satisfaction of slicing into a golden-brown quiche that’s both visually stunning and utterly delicious is unmatched, making it a favorite for any occasion.

Created by

Anna Johnson

Last updated on 2026-01-08T12:42:35.041Z

When I first attempted this Caramelized Onion and Spinach Quiche, I was captivated by the way the sweet onions meld beautifully with the earthy spinach. The key to the perfect onion is cooking them slowly until they're beautifully caramelized, which adds depth to the quiche. Each bite is a delightful contrast of textures and flavors that I find so comforting.

One tip I’ve learned is to let the quiche cool slightly before slicing. This helps the filling set properly, ensuring clean slices. By using a pre-baked crust, I’ve avoided a soggy bottom, making sure the quiche holds its shape and looks appetizing when served.

        Why You Will Love This Recipe
        The combination of sweet caramelized onions and nutritious spinach creates a beautiful flavor profile.
It’s easy to customize, allowing you to add your favorite cheeses or other vegetables.
Perfect for brunch, lunch, or dinner, this quiche is a versatile dish that impresses every time.

      

The Art of Caramelizing Onions

Caramelizing onions may seem simple, but mastering it is crucial for developing deep, rich flavors in this quiche. Start with medium-low heat to avoid burning; the low and slow method allows the natural sugars to develop slowly. Cook the onions until they’re deeply golden, which usually takes 20-25 minutes. If they begin to stick, add a splash of water or broth to deglaze the pan, scraping up any brown bits for added flavor.

For extra depth, consider adding a pinch of sugar or a splash of balsamic vinegar during the last few minutes of cooking. This not only enhances the sweetness but also adds complexity to the flavor profile. Always remember to stir frequently to ensure even cooking and prevent any bitter char, which can detract from the overall taste of your quiche.

Choosing the Right Cheese

In this quiche, cheese plays a pivotal role in creating a creamy texture and enhancing flavor. I recommend using Gruyère for its nutty notes, but feel free to experiment with sharp cheddar or a blend of mozzarella and parmesan if you prefer something different. The key is to ensure that your cheese melts well—opt for freshly shredded instead of pre-shredded to avoid additives that can affect melting.

If you're looking for a healthier twist, consider using a lower-fat cheese or a dairy-free alternative. However, be aware that this can change the texture of the filling, so look for a brand that promises good melting properties. Mixing cheeses can create an exciting flavor range; just remember to adjust the salt, as some cheeses can be saltier than others.

Ingredients

For the Crust

1 1/4 cups all-purpose flour
1/2 cup unsalted butter, chilled and cubed
1/4 teaspoon salt
3-4 tablespoons cold water

For the Filling

2 tablespoons olive oil
2 large onions, thinly sliced
4 cups fresh spinach, chopped
4 large eggs
1 cup heavy cream
1 cup shredded cheese (e.g., Gruyère or cheddar)
Salt and pepper to taste

Instructions

Prepare the Crust

In a mixing bowl, combine flour and salt. Add the cubed butter and mix until the mixture resembles coarse crumbs. Gradually add cold water, one tablespoon at a time, until the dough holds together.

Press it into a disc, wrap in plastic, and refrigerate for 30 minutes.

Caramelize the Onions

In a large skillet, heat olive oil over medium-low heat. Add the sliced onions and cook, stirring frequently, for about 20-25 minutes, until they are golden and caramelized. Stir in the chopped spinach until wilted, then remove from heat.

Make the Filling

In a bowl, whisk together eggs, cream, salt, and pepper. Add the caramelized onion and spinach mixture, along with the shredded cheese. Mix well.

Assemble the Quiche

Preheat the oven to 375°F (190°C). Roll out the chilled crust and fit it into a 9-inch pie pan. Pour the filling into the crust, spreading it evenly.

Bake

Bake in the preheated oven for 35-40 minutes, or until the filling is set and the top is golden. Allow to cool for at least 10 minutes before slicing.

Pro Tips

For extra flavor, add crumbled bacon or goat cheese to the filling. Ensure you use fresh spinach for the best texture. Leftovers can be stored in the refrigerator for up to 3 days and reheated in the oven for optimal taste.

Make-Ahead Tips

If you’re planning for a brunch, this quiche can be made ahead of time. Prepare the crust and filling separately, then assemble and bake it on the day of serving. Alternatively, you can bake it fully, then refrigerate it. When you’re ready to serve, reheat the quiche covered in foil at 350°F (175°C) for about 20-25 minutes. This ensures it stays moist while also allowing the crust to crisp back up.

It’s worth noting that quiche can be stored in the refrigerator for up to three days, making it a great option for meal prep. Just make sure to allow it to cool completely before covering; this will prevent condensation from making the crust soggy.

Serving Suggestions

This Caramelized Onion and Spinach Quiche pairs beautifully with a light side salad dressed in vinaigrette to balance its richness. Consider adding a citrus-based dressing to brighten the palate. You could also serve it alongside fresh fruit or a tangy yogurt sauce to complement the savory flavors.

For a heartier option, consider serving the quiche with a slice of rustic bread or flaky croissants. When garnishing, fresh herbs such as parsley or chives not only add a pop of color but also enhance the flavor beautifully. A dash of hot sauce can kick it up a notch for those who enjoy a little heat!

Questions About Recipes

→ Can I make the quiche ahead of time?

Yes, you can prepare the quiche a day in advance, just bake it when you’re ready to serve.

→ What type of cheese works best?

Gruyère or cheddar are excellent options, but feel free to experiment with your favorites.

→ Can I freeze the quiche?

Yes, you can freeze unbaked or baked quiche. Just wrap it well in plastic before freezing.

→ How do I ensure my crust is flaky?

Keep your butter cold and avoid overworking the dough, as this helps keep the crust tender and flaky.