Zucchini and Tomato Gratin is a vibrant side dish that celebrates summer produce with Layers of tender zucchini and juicy tomatoes baked under a crispy Parmesan-breadcrumb crust. Tender zucchini and ripe tomato slices are drizzled with garlic-thyme oil, then baked until a golden Parmesan-breadcrumb crust crowns the juicy vegetables. With simple pantry staples and fresh herbs, this beginner-friendly gratin brings warmth and flavor to any meal—perfect alongside grilled proteins or a fresh salad. Let’s dive in and bring this colorful bake to your table!
Key Ingredients
Here’s what you’ll need to build those beautiful layers and rich flavors:
- 2 medium zucchini: Sliced rounds that form the hearty, fresh base of the gratin.
- 3 medium tomatoes: Juicy pieces that add vibrant color and acidity.
- 2 cloves garlic: Minced for fragrant, savory depth.
- 2 tbsp olive oil: Helps bind the garlic and thyme, and keeps veggies moist.
- 1 cup grated Parmesan cheese: Melts into a tangy, golden crust.
- 1/2 cup breadcrumbs: Provides crisp, toasty texture on top.
- 1 tsp dried thyme: Earthy herb that infuses the oil mixture.
- 1 tsp salt: Balances and enhances all the flavors.
- 1/2 tsp black pepper: Adds a subtle heat and spice.
- 2 tbsp chopped fresh basil: Bright, herbal garnish for freshness.
How To Make Zucchini and Tomato Gratin
This gratin comes together in just a few simple steps—layering fresh vegetables with a garlicky oil and finishing with a crunchy cheese topping. From preheating to baking, each stage ensures even cooking and maximum flavor.
1. Preheat oven to 375°F and lightly grease a baking dish. Make sure the oven is fully heated before placing in the gratin so it bakes evenly, and coat the dish with a thin layer of oil or cooking spray to prevent sticking.
2. Slice zucchini and tomatoes into 1/4-inch rounds and mince garlic. Aim for uniform thickness so the vegetables cook at the same rate and the garlic distributes evenly.
3. In a small bowl combine olive oil, minced garlic, dried thyme, salt, and black pepper. Stir until the oil is fragrant and the seasonings are fully incorporated.
4. Arrange a layer of zucchini slices in the baking dish, then a layer of tomato slices, repeating until all slices are used. Keep the layers tight but not overlapping too much to allow heat to circulate.
5. Drizzle the garlic-thyme oil mixture evenly over the layered vegetables, making sure every slice gets a little seasoning and moisture.
6. Evenly sprinkle breadcrumbs and grated Parmesan cheese on top, covering the surface for a golden, crispy crust.
7. Bake for 25 to 30 minutes until the top is golden brown and vegetables are tender. Watch the crust—if it browns too quickly, loosely tent with foil.
8. Remove from the oven, garnish with chopped fresh basil, and serve warm for best texture and flavor.
Serving Suggestions
Elevate your Zucchini and Tomato Gratin with these tasty pairings and presentation ideas:
- Serve with a simple green salad tossed in lemon vinaigrette to balance the richness of the cheese.
- Place alongside grilled chicken or fish for a hearty, colorful plate.
- Offer slices of crusty bread to soak up any garlicky juices.
- Top with an extra sprinkle of fresh basil and a drizzle of balsamic glaze to add brightness and sweetness.
Tips For Perfect Zucchini and Tomato Gratin
Nailing this gratin is all about managing moisture and layering flavors. With just a few simple tweaks, you’ll turn this basic bake into a shining star on your table.
- Pat zucchini slices dry with a paper towel before assembling to reduce excess moisture.
- For added creaminess, tuck spoonfuls of ricotta between the vegetable layers.
- Let the gratin rest for 5 minutes before serving to allow flavors to meld.
- Pairs well with a simple green salad or grilled chicken for a complete meal.
How To Store It
Proper storage keeps your gratin fresh, flavorful, and ready for seconds:
- Short-term prep storage: Cover the assembled dish with plastic wrap and refrigerate for up to 2 hours before baking to save prep time.
- Refrigerator: Transfer baked leftovers to an airtight container and chill for up to 3 days.
- Reheating: Warm individual portions in a 350°F oven for 10–12 minutes to revive the crisp topping without sogginess.
- Avoid stacking: Store in a single layer to maintain the crunchy breadcrumb crust.
Frequently Asked Questions
Here are answers to the most common questions about this easy gratin:
- How long does it take to prepare and bake this gratin?
A: It takes about 10 minutes to prepare the vegetables and seasoning, plus 25 to 30 minutes of baking time, for a total of roughly 35 to 40 minutes from start to finish.
- How can I prevent excess moisture from making the gratin soggy?
A: Pat the zucchini slices dry with a paper towel before assembling to remove excess water. You can also salt the zucchini briefly and let it sit for 10 minutes, then blot away the released moisture for even firmer layers.
- Can I add ricotta or other cheeses for extra creaminess?
A: Yes. For added creaminess, tuck spoonfuls of ricotta or soft goat cheese between the vegetable layers before drizzling with the garlic-thyme oil. This enhances richness without altering the baking time.
- How do I know when the gratin is perfectly cooked?
A: The gratin is done when the top is golden brown, the breadcrumbs are crisp, and the vegetables are easily pierced with a fork. If needed, bake an additional 2 to 3 minutes until the desired color and tenderness are reached.
- Can I assemble the gratin ahead of time?
A: You can assemble it up to 2 hours in advance. Cover the dish with plastic wrap and refrigerate. Bring it to room temperature for about 15 minutes before baking to ensure even cooking.
- What’s the best way to store and reheat leftovers?
A: Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat individual portions in a 350°F oven for 10 to 12 minutes or until warmed through to maintain crispness.
- Are there gluten-free or alternative breadcrumb options?
A: You can substitute gluten-free breadcrumbs or crushed gluten-free crackers in a 1:1 ratio. Panko works well for extra crunch, and finely ground almond flour can be used for a low-carb version.
- What are ideal side dishes to serve with this gratin?
A: This gratin pairs beautifully with a simple green salad dressed in lemon vinaigrette, grilled chicken breast, or roasted fish. A crusty baguette also complements the savory, cheesy topping.
What Makes This Special
This Zucchini and Tomato Gratin shines by combining simple, everyday produce with a satisfyingly crunchy, cheesy topping—no fancy techniques required! Its layers of tender zucchini and juicy tomatoes soak up all that garlic-thyme goodness, while the Parmesan-breadcrumb crust adds irresistible texture. It’s the kind of dish that brings everyone to the table smiling. Print this article, save it for your next veggie haul, and let me know how it turns out! Questions, tweaks, or funny kitchen stories? Drop a comment below—I’d love to hear from you.
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Zucchini and Tomato Gratin
- Prep Time: 15 mins
- Cook Time: 30 mins
- Total Time: 45 minutes
- Yield: 4 servings
- Category: Side Dishes
Description
Tender zucchini and ripe tomato slices are drizzled with garlic-thyme oil, then baked until a golden Parmesan-breadcrumb crust crowns the juicy vegetables.
Ingredients
- 2 medium zucchini
- 3 medium tomatoes
- 2 cloves garlic
- 2 tbsp olive oil
- 1 cup grated Parmesan cheese
- 1/2 cup breadcrumbs
- 1 tsp dried thyme
- 1 tsp salt
- 1/2 tsp black pepper
- 2 tbsp chopped fresh basil
Instructions
- Preheat oven to 375 F and lightly grease a baking dish.
- Slice zucchini and tomatoes into 1/4-inch rounds and mince garlic.
- In a small bowl combine olive oil, minced garlic, dried thyme, salt, and black pepper.
- Arrange a layer of zucchini slices in the baking dish, then a layer of tomato slices, repeating until all slices are used.
- Drizzle the garlic-thyme oil mixture evenly over the layered vegetables.
- Evenly sprinkle breadcrumbs and grated Parmesan cheese on top.
- Bake for 25 to 30 minutes until the top is golden brown and vegetables are tender.
- Remove from the oven, garnish with chopped fresh basil, and serve warm.
Notes
- Pat zucchini slices dry with a paper towel before assembling to reduce excess moisture.
- For added creaminess, tuck spoonfuls of ricotta between the vegetable layers.
- Let the gratin rest for 5 minutes before serving to allow flavors to meld.
- Pairs well with a simple green salad or grilled chicken for a complete meal.