Garlic-Parmesan Tomato Casserole Gratin

If you’re searching for a comforting, cheesy, and utterly delicious side dish or light main course, this Garlic-Parmesan Tomato Casserole Gratin is exactly what your kitchen needs. Combining ripe, juicy tomatoes with the rich flavors of garlic, Parmesan, and mozzarella, this casserole gratin bakes to bubbly, golden perfection. It’s simple enough for a weeknight dinner but impressive enough to serve guests, and it pairs beautifully with a variety of dishes. Whether you’re a seasoned cook or a kitchen newbie, this recipe will quickly become a favorite for its ease, flavor, and satisfying texture.

Why This Recipe Is a Must-Try

The Garlic-Parmesan Tomato Casserole Gratin is a celebration of fresh, vibrant ingredients coming together in a dish that feels both rustic and elegant. What sets this recipe apart is the delightful balance between the acidity of the tomatoes and the savory depth of garlic and cheeses. The crunchy breadcrumb topping adds a perfect contrast to the tender tomato layers underneath.

This recipe is versatile and can complement a range of meals, from grilled chicken to pasta dishes. It’s also a great way to showcase garden-fresh tomatoes when they’re in season. For those who love dishes like Tomato Pie Stuffed Mushrooms, this gratin offers a similar burst of tomato flavor in a new form. Plus, it’s an excellent option for anyone looking to add more vegetables to their meals without sacrificing taste.

Ingredients

• 4 large tomatoes, sliced
• 3 cloves garlic, minced
• 1 cup grated Parmesan cheese
• 1 cup shredded mozzarella cheese
• 1/2 cup breadcrumbs
• 1/4 cup olive oil
• 1 teaspoon dried oregano
• Salt and pepper to taste
• Fresh basil leaves for garnish

How To Make Garlic-Parmesan Tomato Casserole Gratin

Step 1: Preheat Your Oven and Prepare Baking Dish

Begin by preheating your oven to 375°F (190°C). Lightly grease a medium-sized baking dish with a bit of olive oil to prevent sticking and to add extra flavor.

Step 2: Slice the Tomatoes

Wash and slice your large tomatoes into approximately 1/4-inch thick slices. Try to keep the slices uniform for even cooking. Lay them out on a paper towel for a few minutes to absorb some of the excess moisture.

Step 3: Mix the Breadcrumb Topping

In a small bowl, combine the breadcrumbs, grated Parmesan cheese, minced garlic, dried oregano, salt, and pepper. Drizzle the olive oil over the mixture and stir until the crumbs are evenly coated. This blend will give your gratin a crunchy, flavorful crust.

Step 4: Assemble the Casserole

Layer half of the tomato slices evenly in the baking dish. Season lightly with salt and pepper. Sprinkle half of the shredded mozzarella over the tomatoes. Add the remaining tomato slices on top, then layer the remaining mozzarella cheese.

Step 5: Add the Breadcrumb Mixture

Evenly spread the breadcrumb and Parmesan mixture over the cheese layer. The olive oil in the crumbs will help it brown nicely in the oven.

Step 6: Bake to Golden Perfection

Place the dish in your preheated oven and bake for 25-30 minutes, or until the top is golden brown and the cheese is bubbling. The tomatoes should be tender but not mushy.

Step 7: Garnish and Serve

Remove the casserole from the oven and let it sit for 5 minutes before serving. Garnish with fresh basil leaves to add a burst of color and fresh herb flavor.

Expert Tips

• Use ripe but firm tomatoes to avoid excess watery casserole layers.
• For extra flavor, roast your garlic before mincing it to add a sweeter, mellow taste.
• Don’t skip the olive oil in the breadcrumb mixture—it’s the key to achieving that golden, crispy topping.
• If you want a bit more herbaceous flavor, sprinkle some fresh thyme or rosemary along with oregano.
• Serve this gratin alongside grilled meats or a crisp salad for a balanced meal.
• To save time, assemble the casserole ahead and refrigerate it for up to 24 hours before baking.
• For a gluten-free version, swap out breadcrumbs for crushed gluten-free crackers or almond flour.

Variations and Customizations

• Add other vegetables: Thin slices of zucchini or eggplant layered with the tomatoes work beautifully.
• Spice it up: Include a pinch of red pepper flakes in the breadcrumb topping for a subtle kick.
• Cheese swaps: Try combining mozzarella with Gruyère or fontina for a different flavor twist.
• Make it vegan: Use vegan cheese alternatives and nutritional yeast in place of Parmesan, and substitute olive oil for butter in the crumb topping.
• Herb variations: Fresh herbs like thyme, parsley, or chives can be added either into the layers or as a garnish.

How to Store Leftovers

Store any leftover Garlic-Parmesan Tomato Casserole Gratin in an airtight container in the refrigerator. It will keep well for up to 3 days. To reheat, cover the dish with foil and warm it in a 350°F (175°C) oven until heated through, about 15-20 minutes. This method helps maintain the casserole’s texture without drying it out. You can also reheat individual portions in the microwave, though the topping may lose some of its crispiness.

FAQ

Can I use canned tomatoes instead of fresh tomatoes?

While fresh tomatoes provide the best texture and flavor for the gratin, you can use high-quality canned tomatoes if fresh ones are unavailable. Drain them well and pat dry to avoid excess moisture.

Is this recipe suitable for meal prep?

Absolutely! This casserole can be assembled in advance and stored in the fridge before baking. It’s a great make-ahead dish for busy weeknights or entertaining.

Can I add protein to this dish?

Yes, you can add cooked chicken, sausage, or even cooked lentils between the tomato layers to make it a more filling meal. Just ensure any added protein is cooked through before layering.

What can I serve with Garlic-Parmesan Tomato Casserole Gratin?

This gratin pairs wonderfully with grilled or roasted meats, fresh salads, or even alongside dishes like Bruschetta With Tomato And Basil for a tomato-themed meal.

Conclusion

The Garlic-Parmesan Tomato Casserole Gratin is a timeless, flavorful dish that balances the freshness of tomatoes with the richness of garlic, Parmesan, and mozzarella. It’s a perfect addition to any meal, whether you’re hosting friends or enjoying a quiet dinner at home. With its simple ingredients and straightforward steps, this recipe invites you to bring a bit of cozy, cheesy comfort to your table. Give it a try and watch as it quickly becomes a go-to favorite in your kitchen repertoire.

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