Irresistible Zucchini Tomato Casserole Recipe

Featured in Perfect Sides.

This Zucchini Tomato Casserole is a hearty, flavorful dish perfect for dinner or a side option. Simple, healthy, and delicious!
Casey - Recipe Author
Updated on Fri Jan 09 2026 at 08:46 AM
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Irresistible Zucchini Tomato Casserole Recipe | Recipes by HomeChef

Oh my gosh, you guys, this zucchini tomato casserole? It's like a warm hug on a plate. It all started a few summers ago when my grandma, bless her soul, handed me her tattered recipe card. Honestly, the ink was practically fading, but the aroma that wafted from the oven that day…pure magic! It was a simple dish, zucchini and tomatoes baked to perfection, but it held so much more than just ingredients. It held memories of lazy summer afternoons, sunshine streaming through the kitchen window, and the comforting chatter of family gathered around the table. I messed it up the first time, completely forgot the garlic (oops!), but even then, it was delicious. That's the beauty of this recipe, it's forgiving, adaptable, and utterly comforting. And now, years later, it's become one of my go-to dishes perfect for those nights when you need a little bit of sunshine in your life.

Why You'll Love This Recipe

  • Honestly, it's super easy even I can't mess it up too badly!
  • Great for picky eaters and perfect for leftovers (yes, even better the next day!)
  • Comfort food appeal that just makes you feel hugged from the inside out
  • Perfect for date nights or cozy nights in it's that versatile!
  • A total meal-prep win when you need it most
  • Has that emotional appeal that just hits different; it's more than just a meal

I remember one time, I was trying to be fancy and used fancy imported tomatoes. To be real, they tasted…off. So I went back to my trusty local farmer's market tomatoes, and everything was right in the world again. Lesson learned!

Ingredients

  • zucchini: About 3 medium zucchini, diced. I prefer the darker green ones, they seem to hold their shape better. And don’t even get me started on the joy of fresh zucchini!
  • Tomatoes: 2 pounds ripe tomatoes, chopped. I've tried using canned tomatoes once…it was a disaster. Stick with fresh, trust me.
  • Onion: 1 large yellow onion, finely chopped. Adds a touch of sweetness and depth I always add a little extra, because who doesn't love onions?
  • Garlic: 4 cloves garlic, minced. This is where I almost always forget to add it initially, oops! But trust me, it's a game-changer.
  • Cheese: 1 cup shredded mozzarella. I’m partial to the kind from my local Italian deli, but any good quality mozzarella works!
  • Breadcrumbs: ½ cup plain breadcrumbs. These add a lovely crunchy topping! I use panko for extra crunch.
  • Olive Oil: 2 tablespoons extra virgin olive oil. It adds flavor and helps everything bake beautifully.
  • Italian Seasoning: 1 tablespoon Italian seasoning. A blend of oregano, basil, thyme, and rosemary. I always use a generous helping!
  • Salt & Pepper: To taste. Always season generously.

Instructions

Step 1: Prep the Veggies:
First, wash and chop all the veggies. Dice the zucchini, chop the tomatoes, and mince the garlic. It’s therapeutic, honestly. This is where I usually put on my favorite podcast.
Step 2: Sauté the Aromatics:
Heat the olive oil in a large skillet over medium heat. Add the onion and sauté until softened, about 5 minutes. Then add the garlic and cook for another minute until fragrant. This is when the kitchen smells amazing!
Step 3: Combine Ingredients:
In a large bowl, combine the sautéed onions and garlic with the zucchini, tomatoes, Italian seasoning, salt, and pepper. Mix everything gently but thoroughly. Don’t be afraid to get your hands dirty!
Step 4: Assemble the Casserole:
Pour the mixture into a greased 9x13 inch baking dish. I always use my grandma's old Pyrex dish it holds so many memories. Sprinkle the mozzarella cheese evenly over the top.
Step 5: Add Breadcrumbs:
Sprinkle the breadcrumbs evenly over the cheese. This adds a nice texture and helps absorb any excess moisture. I like to pat them down gently.
Step 6: Bake:
Bake in a preheated oven at 375°F (190°C) for 30-40 minutes, or until the zucchini is tender and the cheese is bubbly and golden brown. The kitchen will smell heavenly!

You Must Know

  • Don’t overcook the zucchini! It can get mushy. Aim for tender-crisp.
  • Make sure your oven is preheated. I learned that the hard way my first attempt was a disaster.
  • Taste and adjust seasonings as needed. Every tomato is different, so adjust the salt accordingly.

One time, I accidentally added way too much garlic. It was…intense. But hey, at least it taught me to measure my garlic more carefully!

Storage Tips

Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. Honestly, they taste even better the next day! I wouldn’t recommend freezing it, though it gets a little watery.

Ingredient Substitutions

Feel free to experiment! I’ve used different cheeses like parmesan or provolone, and they work well. You could also add other vegetables like bell peppers or mushrooms. I once used yellow squash instead of zucchini, and it was surprisingly good!

Serving Suggestions

This casserole is delicious on its own, but it pairs wonderfully with a simple side salad or some crusty bread. A glass of chilled white wine is also a nice touch. Honestly, this dish and a rom-com? Yes, please!

Cultural Backstory

This recipe isn’t tied to a specific culture, but it represents the simple, comforting food of my family's summers. It’s a reminder of simpler times and the joy of sharing a meal together. It's become a treasured tradition.

Pro Tips

  • Add a sprinkle of red pepper flakes for a little kick.
  • Use different herbs based on your mood oregano, basil, or even a little parsley.
  • In the fall, add roasted butternut squash for a seasonal twist!

This casserole is more than just a recipe; it's a story of family, memories, and the simple joy of good food. I hope you enjoy it as much as I do! Let me know how your version turns out!

Frequently Asked Questions

→ Can I use frozen zucchini?

I wouldn’t recommend it. Frozen zucchini tends to release a lot of water, which can make the casserole soggy. Stick with fresh!

→ What if I don’t have Italian seasoning?

You can substitute with a mix of dried oregano, basil, and thyme. Or just use whatever herbs you have on hand!

→ How do I know when it’s done?

The zucchini should be tender, and the cheese should be melted and bubbly. If the breadcrumbs are starting to brown, you're good to go!

→ How long does it last?

Leftovers will last for about 3 days in the fridge. I find it even tastier reheated the next day!

→ Can I add other vegetables?

Absolutely! Feel free to experiment with other vegetables like bell peppers, mushrooms, or even spinach. Let your creativity run wild!

Irresistible Zucchini Tomato Casserole Recipe

This Zucchini Tomato Casserole is a hearty, flavorful dish perfect for dinner or a side option. Simple, healthy, and delicious!

4.4 out of 5
(31 reviews)
Prep Time
20 Minutes
Cook Time
40 Minutes
Total Time
60 Minutes
By: Casey

Category: Perfect Sides

Difficulty: Beginner

Cuisine: Italian

Yield: 6 Servings

Dietary: Vegetarian

Published: Wed Jul 09 2025 at 02:27 AM

Last Updated: Fri Jan 09 2026 at 08:46 AM

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Ingredients

→ Main Ingredients

01 3 medium zucchini, diced
02 2 pounds ripe tomatoes, chopped
03 1 large yellow onion, finely chopped

→ Seasonings & Spices

04 4 cloves garlic, minced
05 1 tablespoon Italian seasoning
06 Salt and pepper to taste

→ Garnish & Toppings

07 1 cup shredded mozzarella cheese
08 ½ cup plain breadcrumbs

→ Optional Extras

09 Red pepper flakes
10 Other herbs (basil, oregano, parsley)
11 Roasted butternut squash (for fall)

Instructions

Step 01

Wash and chop all the veggies. Dice the zucchini, chop the tomatoes, and mince the garlic. It’s therapeutic, honestly.

Step 02

Heat olive oil in a skillet. Add onion and sauté until softened, about 5 minutes. Add garlic and cook for another minute until fragrant.

Step 03

In a large bowl, combine sautéed onions and garlic with zucchini, tomatoes, Italian seasoning, salt, and pepper. Mix gently but thoroughly.

Step 04

Pour mixture into a greased 9x13 inch baking dish. Sprinkle mozzarella cheese evenly over the top.

Step 05

Sprinkle breadcrumbs evenly over the cheese. This adds texture and helps absorb excess moisture. I like to pat them down gently.

Step 06

Bake in a preheated oven at 375°F (190°C) for 30-40 minutes, or until zucchini is tender and cheese is bubbly and golden brown.

Notes

  1. Don’t overcook the zucchini!
  2. Leftovers can be stored in an airtight container in the refrigerator for up to 3 days.
  3. Other cheeses like parmesan or provolone work well.
  4. Serve with a simple side salad or crusty bread.

Tools You'll Need

  • Large skillet
  • 9x13 inch baking dish

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Dairy (if using cheese)

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 250 calories
  • Total Fat: 12 grams
  • Total Carbohydrate: 25 grams
  • Protein: 8 grams

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