Mediterranean Roasted Vegetable Gratin with Eggplant, Zucchini & Melted Cheese

Roasted Vegetable Gratin is a colorful Mediterranean-inspired side dish made with tender eggplant, zucchini, tomatoes, herbs, olive oil, and melted cheese. The vegetables roast until soft and lightly caramelized, while the cheesy topping adds richness and a golden finish. This is a simple way to turn everyday vegetables into a warm, satisfying dish that works for family dinners, holidays, or meal prep.

The combination of eggplant, zucchini, tomatoes, garlic, and herbs gives Roasted Vegetable Gratin a fresh and savory flavor. It can be served with chicken, fish, beef, or a vegetarian main dish. You can also enjoy it with crusty bread and a simple salad for a lighter Mediterranean-style meal.

Prep Time: 20 minutes
Cook Time: 45 minutes
Total Time: 1 hour 5 minutes
Servings: 6

Ingredients

For the Vegetables

1 large eggplant, sliced into 1/4-inch rounds

2 medium zucchini, sliced into 1/4-inch rounds

3 medium tomatoes, sliced

1 small red onion, thinly sliced

3 cloves garlic, minced

3 tablespoons extra virgin olive oil

1 teaspoon dried oregano

1/2 teaspoon dried thyme

1 teaspoon dried basil

1/2 teaspoon salt

1/4 teaspoon black pepper

1/2 teaspoon paprika

For the Cheese Topping

1 cup shredded mozzarella cheese

1/2 cup grated Parmesan cheese

1/3 cup crumbled feta cheese

2 tablespoons breadcrumbs, optional

1 tablespoon olive oil

For Garnish

Fresh parsley

Fresh basil

Extra Parmesan

Cracked black pepper

Why You’ll Love This Recipe

Roasted Vegetable Gratin is a great way to serve more vegetables without making the meal feel plain or repetitive. Roasting concentrates the natural sweetness of the vegetables and gives the edges a lightly caramelized texture.

The cheese topping adds comfort and richness without covering up the flavor of the vegetables. Mozzarella melts smoothly, Parmesan adds savory depth, and feta brings a salty Mediterranean touch.

Another reason to love Roasted Vegetable Gratin is its flexibility. You can add bell peppers, mushrooms, potatoes, or squash, depending on what you have available.

How to Make Mediterranean Roasted Vegetable Gratin

Step 1: Prepare the Eggplant

Slice the eggplant into even rounds and place them on a large tray.

Sprinkle lightly with salt and let them sit for 10 to 15 minutes.

This step helps draw out some excess moisture.

Pat the slices dry with paper towels before assembling the dish.

Removing extra moisture helps Roasted Vegetable Gratin stay tender without becoming watery.

Step 2: Prepare the Remaining Vegetables

Slice the zucchini and tomatoes into rounds of similar thickness.

Thinly slice the red onion and mince the garlic.

Place the zucchini, tomatoes, and onion in a large bowl.

Drizzle with olive oil and add oregano, basil, thyme, paprika, black pepper, and a small amount of salt.

Toss gently until evenly coated.

Step 3: Arrange the Vegetables

Preheat the oven to 400°F or 200°C.

Lightly grease a medium baking dish with olive oil.

Arrange alternating slices of eggplant, zucchini, and tomato in rows or a spiral pattern.

Tuck slices of red onion between some of the vegetables.

Sprinkle the garlic evenly across the top.

A neat arrangement makes Roasted Vegetable Gratin look especially attractive when it comes out of the oven.

Step 4: First Bake

Cover the baking dish loosely with foil.

Bake for about 25 minutes.

The foil helps the vegetables soften without drying out.

After 25 minutes, remove the foil and check the vegetables. They should be beginning to soften but should not be mushy.

Step 5: Add the Cheese

Sprinkle mozzarella, Parmesan, and feta evenly over the vegetables.

If using breadcrumbs, combine them with 1 tablespoon olive oil and scatter them over the cheese.

This creates a lightly crisp topping and adds extra texture.

Return Roasted Vegetable Gratin to the oven uncovered.

Step 6: Finish Baking

Bake for another 15 to 20 minutes.

The vegetables should be tender, the cheese should be melted, and the top should be golden in spots.

If you want a deeper browned finish, broil for 1 to 2 minutes at the end.

Watch carefully because cheese can brown quickly under the broiler.

Step 7: Rest and Garnish

Remove the baking dish from the oven and let it rest for 5 to 10 minutes.

Resting allows some of the juices to settle and makes the gratin easier to serve.

Finish Roasted Vegetable Gratin with fresh parsley, basil, Parmesan, and cracked black pepper.

Serving Suggestions

Roasted Vegetable Gratin pairs beautifully with grilled chicken, baked fish, salmon, steak, or roasted turkey.

For a vegetarian meal, serve it with quinoa, couscous, lentils, chickpeas, or a fresh bean salad.

Crusty bread is also an excellent choice because it can soak up the flavorful juices from the vegetables.

For a lighter meal, pair Roasted Vegetable Gratin with a Greek salad or simple cucumber and tomato salad.

For another flavorful Mediterranean vegetable side, try our Mediterranean Roasted Cauliflower Steaks.

Recipe Tips

Slice the vegetables evenly so they cook at the same rate.

Do not skip the resting step after salting the eggplant if you want to reduce excess moisture.

Choose firm zucchini and ripe but not overly soft tomatoes.

Use freshly grated Parmesan for better melting and flavor.

Do not overcrowd the baking dish too tightly, or the vegetables may steam instead of roast.

Roasted Vegetable Gratin tastes best when the vegetables are tender but still hold their shape.

If the top begins browning too quickly, cover the dish loosely with foil.

Fresh herbs added after baking give the dish a brighter finish.

Easy Variations

Add sliced bell peppers for more color and sweetness.

For a heartier version, layer in thinly sliced potatoes. Parboil them first so they cook at the same rate as the other vegetables.

Roasted Vegetable Gratin can also be made with yellow squash, mushrooms, or artichoke hearts.

For more protein, add cooked white beans or chickpeas between the vegetable layers.

If you prefer a stronger cheese flavor, replace some of the mozzarella with provolone or Gruyère.

For a spicier version, add red pepper flakes or a pinch of cayenne.

Make-Ahead Instructions

Roasted Vegetable Gratin can be assembled several hours before baking.

Prepare and arrange the vegetables in the baking dish, cover tightly, and refrigerate.

For best results, wait to add the cheese topping until just before baking.

Let the dish sit at room temperature for about 15 minutes before putting it in the oven.

You can also bake the gratin ahead and reheat it shortly before serving.

Storage and Reheating

Store leftover Roasted Vegetable Gratin in an airtight container in the refrigerator for up to 3 days.

Reheat individual portions in the microwave, or warm the whole dish in a 350°F oven until heated through.

For a crispier cheese topping, the oven is the better choice.

If the vegetables release extra liquid during storage, drain off a small amount before reheating.

Freezing is not recommended because zucchini and tomatoes can become very soft after thawing.

Nutrition Information

Approximate nutrition per serving:

Calories: 260
Protein: 12 g
Carbohydrates: 18 g
Fat: 17 g
Saturated Fat: 7 g
Fiber: 5 g
Sugar: 8 g
Sodium: 520 mg

Nutrition values are estimates and may vary depending on the vegetables, cheese, and serving size.

Frequently Asked Questions

Can I use different vegetables?

Yes. Bell peppers, yellow squash, mushrooms, potatoes, and artichokes all work well in Roasted Vegetable Gratin.

Do I have to salt the eggplant first?

It is not absolutely necessary, but salting helps remove some moisture and can improve the final texture.

Can I make it without breadcrumbs?

Yes. The breadcrumbs are optional. The cheese will still create a delicious golden topping.

Can I make this dairy-free?

Yes. Use your favorite dairy-free cheese alternatives or leave the cheese off and top with seasoned breadcrumbs.

Can I use canned tomatoes?

Fresh tomatoes work best because they hold their shape better. Canned tomatoes contain more liquid and may make the dish watery.

Is this a main dish or a side?

Roasted Vegetable Gratin is usually served as a side, but it can become a light main dish when paired with beans, lentils, quinoa, or bread.

How do I stop the gratin from becoming watery?

Salt and dry the eggplant, avoid using overly ripe tomatoes, and do not overcrowd the baking dish. Letting the finished dish rest also helps.

Final Thoughts

Mediterranean Roasted Vegetable Gratin with Eggplant, Zucchini & Melted Cheese is an easy way to turn simple vegetables into a comforting and attractive side dish. The roasted vegetables become tender and flavorful, while mozzarella, Parmesan, and feta create a rich golden topping.

Roasted Vegetable Gratin is especially useful when you need a versatile side that pairs with chicken, fish, meat, or vegetarian mains. It can be adapted with different vegetables and cheeses, making it easy to use ingredients you already have.

Whether you serve Roasted Vegetable Gratin for a weeknight dinner, holiday meal, or casual gathering, its colorful layers, fresh herbs, and melted cheese make it a dish that is both simple and satisfying.

If you enjoy comforting baked meals, you may also like our Chicken & Cabbage Pie.