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Zucchini and Basil Flan Recipe

Published: Jan 24, 2026 · Modified: Feb 17, 2026 by Hazel · This post may contain affiliate links · Leave a Comment

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If you're on the hunt for a dish that's simple yet bursting with freshness and flavor, the Zucchini and Basil Flan Recipe is exactly what you need. This soft, delicate courgette flan marries the creamy richness of Gruyère and Parmesan cheese with the bright, aromatic notes of fresh basil. Whether you enjoy it as a main course or a charming side, it offers a wonderful balance of comfort and lightness that will charm vegetarians and food lovers alike.

Ingredients You'll Need

Zucchini and Basil Flan Recipe

This recipe shines because it uses straightforward, quality ingredients that each play a vital role in creating the perfect texture and flavor. Fresh courgettes bring a tender base, basil adds an herbaceous lift, and cheeses enrich the flan with savory depth. Let's look at what you’ll need:

  • 1 kg of fresh courgettes: Choose firm courgettes for the best texture and a mild, sweet flavor.
  • 60g grated Gruyère cheese: Adds a creamy, nutty richness to the flan.
  • 40g grated Parmesan cheese: Provides a sharp, salty contrast that elevates the dish.
  • 8 tablespoons of whole milk: Ensures the flan gets a smooth, custard-like consistency.
  • 6 whole eggs: The binding agent that holds everything together beautifully.
  • 20 fresh basil leaves: Finely chopped, they infuse the flan with fresh, fragrant notes.
  • Fine salt: Enhances all the natural flavors.
  • Freshly ground black pepper: Adds a subtle hint of warmth and spice.
  • Extra virgin olive oil: Used to gently sauté the courgettes, bringing out their sweetness.

How to Make Zucchini and Basil Flan Recipe

Step 1: Prepare the Courgettes

Start by slicing the courgettes into very thin rounds. This thinness is key to getting that melt-in-your-mouth softness. Heat a drizzle of extra virgin olive oil in a non-stick pan over low heat, then gently sauté the courgette slices. Season with a pinch of salt and freshly ground black pepper as they cook for about 10 minutes until tender but not mushy. Taking it slow ensures the natural sweetness of the courgettes is beautifully highlighted.

Step 2: Mix the Custard Base

While your courgettes are cooking, take a large bowl and beat the whole eggs until smooth. To this, stir in the grated Gruyère and Parmesan cheeses along with the milk. Chop the basil leaves finely and add them to the mixture, followed by salt and pepper to taste. Mixing these ingredients thoroughly ensures your flan will be velvety and rich with every bite.

Step 3: Combine and Cook Gently

Pour the egg and cheese mixture over the cooked courgettes right in the pan. Stir gently over very low heat, taking care not to scramble the eggs like you would with an omelet. The goal here is to combine everything just enough to begin the set without losing that tender flan texture. Once combined, transfer this delicious mixture into an ovenproof dish for baking.

Step 4: Bake to Perfection

Preheat your fan oven to 180°C and bake the flan for about 35 minutes. You'll know it's done when the custard is set firmly and the top is a tempting golden brown. This baking step completes the transformation into a luscious, sliceable flan with a lightly crisp top that contrasts perfectly with the creamy center.

How to Serve Zucchini and Basil Flan Recipe

Zucchini and Basil Flan Recipe

Garnishes

To make your presentation pop, sprinkle a few fresh basil leaves on top just before serving. A light drizzle of extra virgin olive oil adds a glossy finish and subtle fragrance. You can also offer a dollop of mayonnaise or a spicy ketchup on the side to provide a fun and flavorful contrast that complements the flan’s mild character.

Side Dishes

This flan pairs beautifully with crisp green salads dressed in lemon vinaigrette, or roasted root vegetables for a more hearty meal. For a fresh, summery vibe, serve alongside a simple tomato and mozzarella salad sprinkled with cracked black pepper and a touch of balsamic glaze.

Creative Ways to Present

Try slicing the flan into neat squares for a buffet or party tray—it's just the right size for bite-sized indulgence. Another charming idea is to serve it warm in shallow ramekins for individual portions, making the experience feel extra special and cozy.

Make Ahead and Storage

Storing Leftovers

You can keep any leftover zucchini and basil flan in an airtight container in the refrigerator for up to three days. It holds its flavor well and can be enjoyed cold or gently reheated, making it a perfect quick meal option during a busy week.

Freezing

If you want to make this flan ahead for a future meal, it's freezer-friendly too. Wrap individual portions tightly in plastic wrap and then place them in a freezer bag or container. Frozen flan can last for up to one month without losing much texture or flavor.

Reheating

When ready to enjoy, thaw frozen portions overnight in the fridge. Reheat gently in a low oven at 160°C until warmed through, which helps maintain the creamy custard texture without drying it out. Alternatively, microwave in short bursts on medium power for a quick fix.

FAQs

Can I use other herbs instead of basil in this Zucchini and Basil Flan Recipe?

Absolutely! While basil adds a lovely fresh note, you can experiment with herbs like thyme, oregano, or chives for a different flavor profile. Just keep the quantity similar to avoid overpowering the delicate flan.

Is this flan suitable for a gluten-free diet?

Yes! This recipe uses naturally gluten-free ingredients, making it an excellent choice for those avoiding gluten. Always double-check your cheese labels to confirm no additives contain gluten.

Can I make a lighter version of this flan?

Definitely. Swap whole milk for semi-skimmed or even a plant-based milk of your choice, and reduce the amount of cheese slightly. The texture might be a bit less rich but still delicious and satisfying.

How do I prevent the flan from curdling while cooking?

Cooking the custard mixture gently over low heat and stirring carefully prevents it from scrambling. The key is low temperature and gentle folding, rather than vigorous stirring or high heat.

Can this recipe be served cold?

Yes, the Zucchini and Basil Flan Recipe tastes wonderful both warm and cold. Chilling it allows the flavors to meld beautifully and makes it a refreshing dish for summer meals or picnic boxes.

Final Thoughts

I can't recommend the Zucchini and Basil Flan Recipe enough to anyone looking for an easy, flavorful dish that brings a breath of fresh air to your table. It’s forgiving for beginners, excitingly versatile, and endlessly satisfying whether you’re cooking for yourself or sharing with friends. So go ahead and give this flan a try — it's sure to become one of your new favorites.

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Zucchini and Basil Flan Recipe

Zucchini and Basil Flan Recipe


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4.3 from 9 reviews

  • Author: Hazel
  • Total Time: 65 minutes
  • Yield: 6 servings
  • Diet: Vegetarian, Gluten Free
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Description

This zucchini and basil flan is a delicate, soft courgette dish enhanced with creamy Gruyère and Parmesan cheeses and fresh basil leaves. It can be served as a wholesome main course or a flavorful side dish. Perfectly seasoned and baked to a golden finish, it offers a delightful blend of textures and flavors that's ideal for vegetarian and gluten-free diets.


Ingredients

Vegetables

  • 1 kg fresh courgettes (zucchini), sliced very thin

Dairy Products

  • 60 g grated Gruyère cheese
  • 40 g grated Parmesan cheese
  • 8 tablespoons whole milk (or semi-skimmed for lighter version)

Eggs

  • 6 whole eggs

Fresh Herbs

  • 20 basil leaves, finely chopped

Seasoning

  • Fine salt, to taste
  • Freshly ground black pepper, to taste
  • Extra virgin olive oil, for sautéing

Suggestions for Accompanying

  • Mayonnaise sauce
  • Ketchup with a kick (spicy ketchup)


Instructions

  1. Prepare the zucchini: Slice the zucchini into very thin rounds to ensure even cooking and a delicate texture in the flan.
  2. Sauté the zucchini: Heat a drizzle of extra virgin olive oil in a non-stick frying pan over low heat. Add the zucchini slices, season with fine salt and freshly ground black pepper. Cook slowly for approximately 10 minutes until the zucchini is tender but not mushy.
  3. Prepare the egg mixture: In a large bowl, beat the 6 whole eggs thoroughly. Add the grated Gruyère and Parmesan cheeses, 8 tablespoons of whole milk, and the finely chopped basil leaves. Season with salt and pepper, then mix thoroughly until the mixture is smooth and homogeneous.
  4. Combine zucchini and egg mixture: Pour the egg and cheese mixture over the sautéed zucchini in the pan. Gently mix over low heat, stirring carefully to combine without letting the mixture curdle like an omelette.
  5. Transfer and bake: Pour the combined mixture into an ovenproof dish. Place in a preheated fan oven at 180°C (356°F) and bake for 35 minutes. The flan is ready when it is set in the center and golden brown on top.
  6. Cool and serve: Remove the flan from the oven and allow it to cool slightly. Serve warm or cold, accompanied by mayonnaise and spicy ketchup according to taste.

Notes

  • For a lighter version, use semi-skimmed milk and reduce the amount of cheese to your preference.
  • The flan can be served hot or cold, making it versatile for different occasions.
  • Ensure cooking over low heat when mixing eggs and zucchini to prevent curdling.
  • This recipe is gluten-free and suitable for vegetarians.
  • Extra virgin olive oil adds a subtle richness; do not skip or substitute with strong-flavored oils.
  • Prep Time: 20 minutes
  • Cook Time: 45 minutes
  • Category: Healthy Cuisine
  • Method: Baking
  • Cuisine: French

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I’m Hazel, and I created Recipes By Hazel to share the kind of food that feels like home — warm, comforting, and full of meaning.

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