Next, grab your zucchinis and tomatoes. Slice them into 1/4-inch rounds. This thickness allows them to cook evenly. In a large bowl, combine the sliced vegetables with minced garlic, olive oil, oregano, salt, and black pepper. Toss everything together until the veggies are well coated. The aroma will be irresistible!
Step 3: Layer the Ingredients
Now, it’s time to build your gratin. Grease a 9×13-inch baking dish to prevent sticking. Start by layering half of the zucchini and tomato mixture evenly across the bottom. Then, sprinkle half of the shredded mozzarella cheese over the veggies. Repeat with the remaining zucchini and tomatoes, finishing with the rest of the mozzarella. This layering technique ensures every bite is packed with flavor.
Step 4: Add the Topping
In a small bowl, mix the breadcrumbs and grated Parmesan cheese together. This combination creates a crunchy topping that contrasts beautifully with the soft vegetables. Sprinkle this mixture evenly over the top of your layered gratin. It’s the finishing touch that makes all the difference!
Step 5: Bake to Perfection
Place your baking dish in the preheated oven and bake for 30-35 minutes. Keep an eye on it! You’ll know it’s done when the top is golden brown and the vegetables are tender. A fork should easily pierce through the layers.
Step 6: Cool and Serve
Once baked, remove the gratin from the oven and let it cool for about 5 minutes. This cooling time helps the layers set, making it easier to serve. If you like, garnish with fresh basil leaves for a pop of color and flavor. Now, dig in and enjoy your delicious Zucchini Tomato Gratin!

Tips for Success
- Use fresh, seasonal vegetables for the best flavor and texture.
- Don’t skip the preheating step; it’s key for even cooking.
- Experiment with different cheeses like cheddar or feta for a unique twist.
- Let the gratin cool slightly before serving to help it hold its shape.
- Feel free to add herbs like thyme or rosemary for extra depth.
Equipment Needed
- Baking Dish: A 9×13-inch dish is ideal, but any oven-safe dish will work.
- Knife: A sharp knife for slicing vegetables.
- Cutting Board: Essential for safe and easy chopping.
- Mixing Bowl: Any large bowl for combining ingredients.
- Measuring Cups: Useful for precise ingredient quantities.
Variations
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