Every summer, when the garden is overflowing with ripe tomatoes and tender zucchini, I find myself searching for new ways to use them together. Truth be told, I’m constantly on the search for healthy, new recipes. I love to experiment and try new things. I’m not a creature of habit who like to eat the same meals all the time time. I don’t know what it is, but I just can’t.

This tomato zucchini casserole recipe is just one of those newer recipes that can become a new favorite for you and your family!

It’s the kind of dish that tastes like comfort food while still being light and fresh. Think layers of zucchini, juicy tomatoes, a sprinkle of breadcrumbs and cheese, all baked into bubbly goodness. Whether you call it a tomato zucchini bake or a tomato zucchini gratin, this recipe is the perfect way to let simple vegetables shine.

This post is all about tomato zucchini casserole.

Table of Contents

Why You’ll Love This Tomato Zucchini Casserole

This tomato zucchini casserole is one of those recipes that proves simple ingredients can come together to make something special. If you’re looking for a healthy and flavorful way to enjoy garden vegetables, this dish checks all the boxes.

Easy & Healthy – A light alternative to heavier comfort food, this tomato zucchini bake uses fresh vegetables layered with herbs and cheese for a wholesome meal.
Perfect for Seasonal Produce – It’s the best way to use up ripe tomatoes and zucchini from your summer garden or farmers’ market. Any time there’s a way to use fresh basil from the garden, I’m all for it. I love adding basil to this dish.
Versatile Side or Main – Serve this tomato zucchini gratin as a meatless main dish or as a flavorful side for grilled chicken, fish, or pasta.
Crowd-Pleasing Flavor – The combination of juicy tomatoes, tender zucchini, and melted cheese is a classic that feels both rustic and comforting.

Whether you call it a tomato zucchini bake or a tomato zucchini gratin, this dish is simple to prepare, budget-friendly, and bursting with flavor. It’s one of those recipes you’ll want to add to your weekly rotation.

Ok, let’s dive into the recipe now!

Tomato Zucchini Casserole Recipe

This tomato zucchini casserole is a light, flavorful dish that layers fresh zucchini and juicy tomatoes with herbs and cheese for the perfect balance of comfort and freshness. Whether you call it a tomato zucchini bake or a tomato zucchini gratin, this recipe is easy to prepare, budget-friendly, and ideal for using up seasonal produce. Serve it as a wholesome vegetarian main dish or as a savory side alongside grilled meats or pasta. It’s a simple way to bring the flavors of the garden straight to your table.

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Prep Time 15

Cook Time 35

Total Time 50

Course Side Dish

Cuisine American

Servings 6

Equipment

cutting board
Sharp Knife
9×9 Baking dish
Mixing bowl
Spoon for layering
Foil (to cover if needed)

Ingredients

2 medium zucchini thinly sliced
3 medium tomatoes thinly sliced
1 small onion thinly sliced (optional)
2 cloves garlic minced
2 tbsp olive oil
½ tsp salt
¼ tsp black pepper
1 tsp dried Italian herbs or oregano + basil
½ cup shredded mozzarella cheese
¼ cup grated Parmigiano reggiano cheese
½ cup breadcrumbs panko, homemade, or gluten free
2 tbsp fresh basil chopped (for garnish)

Instructions

Preheat the oven to 375°F (190°C). Lightly grease your baking dish with olive oil.
Slice zucchini, tomatoes, and onion into even rounds. Pat the tomatoes dry with a paper towel to reduce excess moisture.
In a mixing bowl, toss sliced zucchini and onion with olive oil, garlic, salt, pepper, and herbs.
Next it's time to layer your veggies. Alternate slices of zucchini and tomato in the baking dish, overlapping them slightly like a spiral or rows. Tuck onion slices in between layers.
Sprinkle with breadcrumbs, mozzarella, and Parmesan. Drizzle a touch more olive oil over the top.
Bake uncovered for 30–35 minutes, until veggies are tender and the top is golden and bubbly. Cover with foil halfway if the breadcrumbs brown too quickly.
Sprinkle with fresh basil before serving.

Keyword tomato zucchini casserole

Tips & Variations

There are a few ways to mix up this dish and change it to your needs and taste. You can add protein, bulk it up, take out the breadcrumbs, make it cheesier, or make a large batch. Here’s what you can add:

Make It a Meal: Add cooked quinoa, lentils, or shredded chicken to turn this side into a main dish.
Gluten-Free: Use gluten-free breadcrumbs or omit them for a lighter gratin.
Extra Cheesy: Add slices of fresh mozzarella or goat cheese for a creamier bake.
Batch Friendly: Easily double the recipe for large gatherings.

Serving Suggestions

This tomato zucchini casserole pairs beautifully with roasted chicken, grilled fish, or a simple green salad. It’s also lovely as part of a vegetarian spread, alongside crusty bread or a bowl of soup.

This post is all about tomato zucchini casserole.