Name: Crustless Spinach, Onion, and Feta Quiche
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Ingredients: 1 medium onion, diced (yellow or sweet); 6 ounces fresh baby spinach (or frozen) (Thaw and drain thoroughly if using frozen.); 2 large eggs; ½ cup Egg Beaters (liquid egg substitute) (Or replace with one additional whole egg if preferred.); ½ cup feta cheese, crumbled (Optional; cheddar or mozzarella work well as substitutes.); ½ cup all-purpose flour (For gluten-free version, use 1:1 gluten-free baking flour.); ½ teaspoon baking powder; Salt and pepper to taste

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I remember the first time I made this crustless spinach, onion and feta quiche—it felt like a light, savory cloud that came together faster than I expected. With tender sautéed onions, bright baby spinach, and salty feta folded into a simple egg-and-flour base, this quiche is perfect when you want a low-effort, high-flavor meal for brunch, lunch, or an easy weeknight dinner. If you’re curious about timing and tips I used while testing, check my notes for more context at my full recipe notes.

Why you’ll love this dish

This crustless quiche is one of those recipes that hits several sweet spots: it’s quick, economical, and forgiving. Because there’s no crust to fuss with, prep time is shorter and the result is lighter—great when you want something satisfying without the heaviness of pastry. It’s also easy to customize (swap feta for cheddar, add herbs or tomatoes), and the texture holds up well for leftovers.

“A weekday hero—simple to make, bright with spinach, and the feta adds the perfect salty pop.”

Why choose it for certain occasions:

Weeknight dinners: ready in about 40–50 minutes total and uses pantry staples.
Brunch or light lunch: pairs beautifully with a simple salad.
Meal prep: slices reheat well for a quick protein-packed meal.

Step-by-step overview

Before you dive into the ingredients, here’s how the recipe comes together:

Sauté diced onion until soft and slightly caramelized.
Wilt the spinach (or thaw and squeeze frozen spinach) and combine with the onion.
Whisk eggs and egg substitute, then stir in flour and baking powder to give the custard body.
Fold in the spinach mixture and crumbled feta.
Bake until set and lightly golden, then let rest before slicing.

This quick outline keeps the process approachable and helps you plan your timing—onion first, spinach next, then mix and bake.

What you’ll need

1 medium onion, diced (yellow or sweet)
6 ounces fresh baby spinach (or frozen—thaw and drain thoroughly)
2 large eggs
½ cup Egg Beaters (liquid egg substitute) — or replace with one additional whole egg if preferred
½ cup all-purpose flour
½ teaspoon baking powder
½ cup feta cheese, crumbled (optional; cheddar or mozzarella work well as substitutes)
Salt and pepper to taste

Notes and substitutions:

For a gluten-free version, swap the flour for a 1:1 gluten-free baking flour and expect a slightly different crumb.
If you use frozen spinach, press it firmly in a towel to remove excess moisture—too much liquid will make the quiche runny. For more ingredient tips and measurements I tested, see the helpful guide at ingredient substitutions and measurements.

How to prepare it

Crustless spinach quiche with onion and feta ingredients and baked dish

Preheat your oven to 350°F (175°C). Grease a 9-inch pie dish or an 8-inch square baking pan.
Heat a tablespoon of olive oil or butter in a skillet over medium heat. Add the diced onion and a pinch of salt. Sauté until soft and just beginning to caramelize, about 6–8 minutes. Remove from heat.
Add spinach to the hot pan and stir until wilted (if using fresh). If using frozen, make sure it’s thawed and squeezed dry before adding. Let the mixture cool slightly.
In a mixing bowl, whisk the 2 eggs with the ½ cup Egg Beaters (or third egg if substituting). Stir in the flour and baking powder until mostly smooth—small lumps are okay. Season with salt and pepper.
Fold the cooled onion and spinach into the egg mixture, then add the crumbled feta and combine evenly.
Pour the batter into the prepared dish and smooth the top. Bake on the center rack for 30–40 minutes, or until the top is set, slightly golden, and a toothpick inserted near the center comes out clean.
Let the quiche rest for 10–15 minutes before slicing; this helps it finish setting and makes for neater slices.

Baking notes: Oven times vary—start checking at 25 minutes if your oven runs hot. If the top browns too quickly, tent loosely with foil.

Best ways to enjoy it

Serve warm with a crisp green salad dressed in lemon vinaigrette for contrast.
Pair with roasted cherry tomatoes and crusty bread for a more substantial meal.
For brunch, offer a side of fresh fruit and a light yogurt parfait.
Slice into smaller squares for finger-food style servings at a potluck or shower.

For plating, a dusting of freshly cracked black pepper and a few extra feta crumbles on top finish the dish beautifully.

Storage and reheating tips

Cool completely, then refrigerate in an airtight container for up to 3–4 days.
To reheat: place slices in a 350°F (175°C) oven for 8–12 minutes until warmed through, or microwave briefly (30–60 seconds) if you’re in a hurry—oven reheating preserves texture best.
To freeze: wrap cooled slices tightly in plastic and foil or use a freezer-safe container. Freeze for up to 2 months. Thaw overnight in the refrigerator and reheat in the oven.
Food safety: refrigerate within two hours of baking to prevent bacterial growth.

Pro chef tips

Squeeze the spinach well: excess moisture is the most common reason crustless quiches turn out watery.
Don’t overwhisk once flour is added—overmixing can develop gluten and make the texture chewier.
Let it rest: cooling on the counter for 10–15 minutes helps the center set so you get clean slices.
Use a light hand with salt if using store-bought feta—some are saltier than others. For more creative pointers and photos from my trials, check out more variations and photos.

Creative twists

Tomato & herb: add halved cherry tomatoes and a tablespoon of chopped fresh basil or dill.
Cheesy swap: replace feta with sharp cheddar for a mellower, melty version.
Add protein: stir in cooked bacon pieces, diced ham, or smoked salmon for a heartier dish.
Vegan-ish: for an egg-free alternative, experiment with a chickpea-flour “batter” and vegan cheese—results will differ but can be delicious.

Your questions answered

Q: Can I use frozen spinach?
A: Yes—just thaw completely and squeeze out all excess water before mixing. Otherwise the quiche can be soggy.

Q: How long does this take from start to finish?
A: Plan on 10–15 minutes active prep (sautéing the onion and wilting spinach plus mixing) and 30–40 minutes baking—roughly 45–55 minutes total.

Q: Can I make this ahead for a gathering?
A: Absolutely. Bake, cool, and refrigerate. Reheat in a 350°F oven until warm. You can also bake the day before and serve at room temperature.

Q: Is this recipe kid-friendly?
A: Very much so—mild flavors, easy-to-cut slices, and you can swap feta for milder cheeses like cheddar or mozzarella to suit picky eaters.

Q: What pan should I use?
A: A 9-inch pie dish or an 8-inch square pan works well; an 8-inch pan will produce a slightly thicker quiche.

Conclusion

If you’d like to compare this version with other takes, the original inspiration and a slightly different method are available at the Baking Bites crustless spinach, onion and feta quiche. For another home-cook-friendly version with step-by-step photos, see the Served From Scratch crustless spinach and feta quiche write-up. And if you want a variation that adds tomatoes to the mix, check Kylee Cooks’ spinach, tomato and feta crustless quiche for inspiration.