Look at that thick, deep-dish slice pulled fresh from the oven: deeply caramelized, golden-brown edges wrapping around a fluffy, tender egg custard packed with vibrant green zucchini strands, rich pockets of melted Greek feta, and rich Mediterranean black olives. Garnished with finely chopped fresh chives and finished with an eye-catching drizzle of warm chili extra virgin olive oil glistening across the plate, this Mediterranean Zucchini, Feta, and Olive Crustless Quiche brings rustic coastal flavors straight to your dining table.
If you are looking for a high-protein, naturally lower-carb alternative to traditional heavy pie-crust quiches, this recipe is your golden ticket. With just 15 minutes of hands-on preparation time, you can whip up a comforting bake that feels luxurious enough for a weekend brunch yet simple enough for weeknight meal prep.
Beyond its incredible taste and texture, this bake aligns naturally with heart-healthy Mediterranean diet principles. By emphasizing polyphenol-rich extra virgin olive oil, nutrient-dense summer vegetables, and authentic sheep’s milk cheese instead of heavy processed fats or refined pie dough, every slice nourishes your body while delighting your palate.
What Makes This Recipe Truly Mediterranean?
- The Flavor Trio: The soul of this dish lies in its harmonious Mediterranean flavor trilogy: tangy Greek feta cheese, briny dark black olives (or Kalamata olives), and fresh summer zucchini. Together, they create a balanced contrast of savory, creamy, and herbal notes in every bite.
- Smart Cheese Swaps: While many western egg bakes rely heavily on sharp cheddar, this authentic Mediterranean Zucchini, Feta, and Olive Crustless Quiche features traditional regional cheeses. Swapping cheddar for Greek graviera, kasseri, or shredded low-moisture mozzarella preserves authentic regional flavor while providing the necessary binding structure and yielding that signature crispy, golden-brown outer crust. If you love savory zucchini dishes, you might also enjoy our popular Baked Parmesan Zucchini Rounds.
- Heart-Healthy Chili Olive Oil Finish: Ditching seed oils and heavy gravies entirely, this dish is finished with a drizzle of cold-pressed extra virgin olive oil infused with Aleppo pepper or red chili flakes. This vibrant finishing touch adds a gentle heat, elevates the healthy fat profile, and enhances the visual presentation on the plate.
Key Ingredients & Authentic Substitutions
- Zucchini: 2 medium zucchini, freshly grated. Summer squash provides moisture, body, and subtle sweetness.
- Eggs: 4 large pasture-raised eggs create a rich, velvety egg custard that holds the bake together.
- Feta Cheese: ½ cup crumbled real sheep’s milk Greek feta. The distinct tang cuts through the richness of the eggs.
- Melting Cheese: ½ cup shredded low-moisture mozzarella, graviera, or kasseri. This gives the quiche structural integrity and forms a gorgeous brown crust along the sides of the pan.
- Olives: ½ cup sliced pitted black olives or Kalamata olives (reserve a few extra slices to press onto the top before baking).
- Flour & Leavening: ½ cup all-purpose flour combined with 1 tsp baking powder. This small addition gives the crustless quiche its impressive puffed height and cake-like texture without needing a pastry shell.
- Fresh Herbs & Spice: 2 tbsp fresh chives or dill, freshly cracked black pepper, sea salt, and chili-infused extra virgin olive oil for serving.
The Secret to a Non-Soggy Crustless Quiche (Pro Technique)
Zucchini contains over 90% water. If added directly to the egg mixture, that excess moisture will release during baking, resulting in a watery, collapsed egg bake. Follow this mandatory two-step technique to guarantee a firm, golden slice every single time:
- Step 1: Grate the zucchini into a bowl and sprinkle with ½ tsp salt. Toss lightly and let it sit undisturbed for 10 minutes. The salt draws out the trapped cellular water through osmosis.
- Step 2: Transfer the salted zucchini into a clean kitchen towel or cheesecloth. Gather the edges and squeeze forcefully over the sink until no more liquid drips out. You should extract roughly ⅓ to ½ cup of water!
How do you keep crustless zucchini quiche from getting watery? Salt the grated zucchini and allow it to sit for 10 minutes, then forcefully wring out all excess liquid using a clean kitchen towel or cheesecloth before folding it into the egg batter. Removing this excess moisture ensures a fluffy, firm slice that holds its structure.
Step-by-Step Instructions
- Preparation: Preheat your oven to 375°F (190°C). Generously grease an 8-inch round cake pan, deep pie dish, or springform pan with extra virgin olive oil or non-stick spray.
- Whisk the Base: In a large bowl, whisk together 4 large eggs, ½ cup all-purpose flour, 1 tsp baking powder, a pinch of salt, and freshly cracked black pepper until smooth and completely lump-free.
- Fold: Gently fold the thoroughly squeezed, dry zucchini, crumbled feta, shredded mozzarella (or graviera), sliced black olives, and chopped fresh chives into the egg batter using a rubber spatula until evenly distributed.
- Assemble: Pour the batter into your prepared baking dish and smooth the top with your spatula. Arrange a few thin zucchini wheels and black olive halves across the top surface for a bakery-worthy presentation.
- Bake: Place on the center rack and bake for 30–35 minutes. The quiche is ready when the center is set, the top is beautifully puffed, and the outer edges turn a deep golden-brown with a crispy lattice appearance.
- Rest & Serve: Allow the quiche to cool in the pan for 10 minutes so the custard sets firmly. Slice into deep wedges, garnish with fresh chives, and finish with a drizzle of spicy chili extra virgin olive oil.
Recipe Variations & Dietary Adaptations
- Gluten-Free Alternative: Replace the all-purpose flour with an equal amount (½ cup) of a 1:1 gluten-free baking flour blend or fine almond flour.
- Keto / Ultra Low-Carb: Use ½ cup almond flour or ¼ cup coconut flour in place of white flour to reduce total net carbs down to minimal levels.
- Extra Protein Boost: Fold ½ cup of full-fat Greek yogurt or cottage cheese directly into the egg batter before mixing in the vegetables. If you love high-protein savory bakes, explore our Crustless Spinach, Sun-Dried Tomato and Feta Quiche for another comforting variation.
Mediterranean Zucchini, Feta, and Olive Crustless Quiche
Ingredients
Method
- Preheat oven to 375°F (190°C). Lightly grease an 8-inch round cake pan or deep pie dish with extra virgin olive oil.
- Place grated zucchini in a bowl, toss with 1/2 tsp salt, and let sit for 10 minutes.
- Transfer zucchini to a clean kitchen towel or cheesecloth and squeeze thoroughly over the sink to remove all excess water.
- In a large bowl, whisk together eggs, all-purpose flour, baking powder, cracked black pepper, and a light pinch of salt until smooth and lump-free.
- Fold in drained zucchini, crumbled feta cheese, shredded mozzarella, sliced black olives, and fresh chives until evenly combined.
- Pour the batter into the prepared pan, smooth the top, and arrange extra zucchini rounds and black olive halves on top.
- Bake for 30 to 35 minutes until the center is set and edges are deep golden-brown and crispy.
- Cool for 10 minutes, slice into deep wedges, drizzle with chili extra virgin olive oil, and garnish with remaining chives before serving.
Notes
– Always wring out the zucchini thoroughly to prevent a watery center.
– Do not use wine or pork products in this recipe.
Serving Suggestions & Side Pairings
- Breakfast / Brunch: Serve a warm wedge alongside freshly sliced heirloom tomatoes, warm artisan flatbread, and an iced Greek frappé or herbal tea.
- Lunch / Dinner: Pair this deep-dish bake with a fresh, crisp Greek Chopped Feta Salad recipe or lemon-roasted Mediterranean potatoes for a complete, well-balanced meal.
Meal Prep, Storage, and Reheating
- Refrigeration: Allow leftovers to cool completely, then store sliced wedges in an airtight container in the refrigerator for up to 4 days.
- Reheating: For best results and to restore those crispy, caramelized edges, reheat slices in an air fryer or oven at 350°F (175°C) for 5–7 minutes. Avoid microwaving when possible, as it can make the egg structure soft or rubbery.
- Freezing: Wrap individual cooled wedges tightly in parchment paper and aluminum foil, then store in a freezer bag for up to 2 months. Thaw overnight in the fridge before reheating in the oven.
Frequently Asked Questions (PAA Target)
Is a crustless quiche the same as a frittata?
While similar, they differ in cooking technique and texture. A frittata is typically started in a skillet on the stovetop and finished under a broiler, relying entirely on eggs and dairy for structure. A crustless quiche uses a small amount of flour and baking powder in the egg custard and is baked entirely in the oven, resulting in a taller, fluffier, cake-like slice.
Can I make this crustless zucchini quiche ahead of time?
Yes! This quiche is excellent for meal prep. You can bake it completely a day in advance, let it cool, and keep it covered in the refrigerator. Slice and reheat in a 350°F oven for 10 minutes before serving, or enjoy slices chilled or at room temperature.
Why did my crustless quiche collapse after baking?
A slight deflate as the quiche cools is normal due to steam escaping, but a severe collapse usually indicates excess liquid in the batter from un-squeezed zucchini or over-whisking the eggs, which introduces excessive air bubbles that burst while baking. Squeezing your zucchini dry ensures a stable internal structure.