Herbed Zucchini & Tomato Casserole Gratin

If you’re on the hunt for a vibrant, comforting dish that brings together the fresh tastes of summer vegetables, look no further than this Herbed Zucchini & Tomato Casserole Gratin. It’s a flavorful, cheesy, and herb-infused delight that showcases the best of zucchinis and cherry tomatoes baked to golden perfection. This recipe is not only easy to prepare but also incredibly satisfying, making it a wonderful addition to weeknight dinners or special occasions alike. Whether you’re a seasoned home cook or just starting out, this casserole gratin will quickly become a favorite in your recipe collection.

Why This Recipe Is a Must-Try

What sets this Herbed Zucchini & Tomato Casserole Gratin apart is the harmonious blend of fresh produce, aromatic herbs, and melty cheeses, all topped with a crispy breadcrumb crust. The combination of mozzarella and Parmesan offers depth and creaminess, while the dried basil and oregano infuse the dish with a warm, Mediterranean flair. This casserole is a fantastic way to make the most of zucchini and cherry tomatoes when they’re in peak season.

Moreover, it’s a one-dish wonder that’s both hearty and wholesome. If you love dishes like the Heirloom Tomato Goat Cheese Galette, you’ll appreciate how this gratin elevates simple vegetables into a comforting, cheesy masterpiece. It’s perfect as a side or even a main course for those looking for a satisfying vegetarian option.

Ingredients

• 4 medium zucchinis, sliced
• 2 cups cherry tomatoes, halved
• 1 medium onion, chopped
• 3 cloves garlic, minced
• 1 cup grated mozzarella cheese
• 1 cup grated Parmesan cheese
• 1/2 cup breadcrumbs
• 1/4 cup olive oil
• 2 teaspoons dried basil
• 2 teaspoons dried oregano
• Salt and pepper to taste

How To Make Herbed Zucchini & Tomato Casserole Gratin

Step 1: Prepare the Vegetables

Begin by washing and slicing the zucchinis into thin rounds. Halve the cherry tomatoes and chop the onion finely. Mince the garlic cloves to release their vibrant aroma. These fresh ingredients form the base of your casserole gratin.

Step 2: Sauté the Onion and Garlic

Heat half of the olive oil in a large skillet over medium heat. Add the chopped onion and cook until softened, about 5 minutes. Stir in the minced garlic and cook for another minute until fragrant. This step builds a flavorful foundation for the gratin.

Step 3: Combine Zucchini, Tomatoes, and Herbs

Add the sliced zucchinis and halved cherry tomatoes to the skillet. Sprinkle the dried basil, oregano, salt, and pepper over the vegetables. Toss everything together and cook for about 5-7 minutes, just until the vegetables begin to soften but still hold their shape.

Step 4: Assemble the Casserole

Preheat your oven to 375°F (190°C). Lightly grease a baking dish with the remaining olive oil. Transfer the sautéed vegetables into the dish, spreading them evenly. Sprinkle the grated mozzarella and Parmesan cheese over the top.

Step 5: Add the Breadcrumb Topping

In a small bowl, mix the breadcrumbs with a drizzle of olive oil to help them crisp up nicely in the oven. Evenly distribute the breadcrumb mixture over the cheese layer. This topping will add a golden, crunchy contrast to the creamy cheeses beneath.

Step 6: Bake Until Golden and Bubbling

Place the casserole in the preheated oven and bake for 25-30 minutes. The gratin is ready when the cheese is bubbly and golden brown, and the breadcrumb topping is crispy. Let it cool for a few minutes before serving to allow the flavors to meld.

Expert Tips

• Slice the zucchinis evenly to ensure they cook at the same rate and the casserole bakes uniformly.
• For extra flavor, consider using fresh herbs if available, such as fresh basil and oregano, in place of dried.
• Don’t overcrowd the skillet when sautéing the vegetables; cook them in batches if needed to avoid steaming.
• Use freshly grated cheeses rather than pre-shredded for better melting and taste.
• Try serving this gratin alongside a protein or a fresh salad for a balanced meal.

Variations and Customizations

• Add Protein: Incorporate cooked chicken breast or turkey sausage for a heartier dish.
• Cheese Swap: Substitute mozzarella with provolone or fontina for a different cheesy twist.
• Herb Mix: Experiment with thyme, rosemary, or a pinch of red pepper flakes for added flavor complexity.
• Breadcrumb Alternatives: Use crushed pita chips or gluten-free breadcrumbs for a different texture or dietary preference.
• Make it Vegan: Use vegan cheese alternatives and nutritional yeast instead of Parmesan.

How to Store Leftovers

Once cooled, transfer any leftover Herbed Zucchini & Tomato Casserole Gratin to an airtight container. Store it in the refrigerator for up to 3 days. To reheat, place individual servings in the oven at 350°F (175°C) for 10-15 minutes or until warmed through and the topping regains its crispiness. Avoid microwaving if possible, as this may make the breadcrumb topping soggy.

FAQ

Can I prepare this casserole in advance?

Absolutely! You can assemble the casserole a day ahead and keep it covered in the refrigerator. When ready, bake it fresh to enjoy a hot and bubbly gratin with a crispy topping.

What can I serve with Herbed Zucchini & Tomato Casserole Gratin?

This dish pairs beautifully with simple proteins like grilled chicken or fish and a crisp green salad. It also complements grain-based sides like quinoa or couscous for a well-rounded meal.

Is it possible to freeze this casserole?

Yes, you can freeze the casserole before baking. Cover it tightly with foil and freeze for up to 2 months. When ready to enjoy, bake it from frozen, adding extra time to ensure it heats through completely.

Can I use other types of tomatoes?

While cherry tomatoes work best for their sweetness and juiciness, you can substitute with grape tomatoes or diced roma tomatoes. Just keep in mind that larger tomatoes may release more liquid, so adjust cooking times accordingly.

Conclusion

This Herbed Zucchini & Tomato Casserole Gratin is a delicious celebration of fresh vegetables, herbs, and cheeses baked to perfection. Its comforting layers and crisp topping make it a standout dish that’s both simple and sophisticated. Whether you’re looking to impress guests or simply enjoy a wholesome meal at home, this casserole gratin is an excellent choice. Don’t forget to try this recipe alongside other vegetable-forward dishes for a delightful, seasonal spread.

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