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You are here: Home » Side Dishes

Spiciness: Mild

Baked Zucchini and Tomato Casserole

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This is a simple, healthy, and delicious oven baked zucchini and tomato casserole recipe to make when zucchinis and tomatoes are fresh and abundant in the summer.

Close up of Zucchini & Tomato Casserole in an oval white baking dish. Parmesan melted on top with chopped walnuts. this …

Layered thin sliced zucchini, tomato, walnuts, garlic, Italian seasoning, and Parmesan cheese baked in the oven at 375F for 50 minutes or until zucchini is soft and the top starts to brown.  Summer casserole love!

Rectangle colander on white dish towel filled with 4 whole zucchinis and 3 red and purple tomatoes.

Baked Zucchini Tomato Casserole is Versatile

There are so many ways to change up this simple zucchini tomato casserole.

For one, fill it up with more zucchini, more tomatoes, or more cheese. The limiting factor is the size of your baking dish but remember that more layers will take longer to cook in the oven.

Ingredients on a wood cutting board: sliced tomatoes, grated cheese, chopped nuts, minced garlic, seasoning. Plate of sliced zucchini on side. Top view.
  • More Parmesan cheese (or any kind of cheese for that matter) can be added to this zucchini tomato casserole bake. Try adding cheddar cheese, colby jack, Mozzarella, feta cheese, or goat cheese (talk about creamy!).
  • Try adding some fresh herbs like rosemary, parsley, or thyme. Don't have any? No problem add some dried herbs instead.
  • Mix it up! The beauty of this layered zucchini tomato bake is that it can take the addition of your favorite spices. Try some chili powder, curry powder, or cayenne for spice.
  • Try a different nut: pine nuts, slivered almonds, pecans...
Unbaked layered casserole pan with sliced zucchini and tomatoes layered with walnut pieces and mozzarella cheese.
Getting ready to go in the oven.

Salt Is Your Friend With Zucchini's and Tomatoes

Hear me out unless you are on a low sodium diet. I understand that. But if you are not, then do not be afraid to salt the zucchini tomato casserole before, during, or after cooking.

A lot of the salt leaks into the liquid that is left (which is also delicious if you're not worried about salt. If something is amiss, try salt first. Then try adding cheese 🙂

Round pie pan filled with sliced zucchini tomatoes with walnuts and cheese baked and crisp. 2 fork in the background. Top view.

Troubleshooting Baked Zucchini and Tomato Casserole

  • Add more salt - There will be a layer of liquid in the bottom of the pan because both zucchini and tomatoes have a lot of water.  The salt will go into the liquid but the top may need some more salt.
  • Add as much cheese as you like to this dish!  Some other delicious cheese options are feta cheese and goat cheese.
  • Zucchini too crispy? Cook it for 1 hour and see where that gets you. 50 minutes in my oven is perfect for me and provides a little crisp on the outside and tender but not soggy inside.
  • Try to make sure that you layer the zucchini as individual pieces and not just stack them on top of each other. This will help it cook more thoroughly.
  • The bottom zucchini are more done than the top because they are cooking in liquid. To make them all the same you would need to cook all the zucchini slices in simmering water for a couple minutes, which would make the recipe a little more complex.
Slice of zucchini and tomato casserole pie on a white plate with knife and large casserole in the background. Side view.

Serving Suggestion

Serve this Zucchini and Tomato Casserole dish with a complementary main dish recipe like:

  • Stainless steel deep skillet filled with white beans and diced tomatoes with a lightly pulsed pesto of kale and almonds.
    Cannellini Beans with Kale Pesto
  • Top view of crispy browned bone in, skin on chicken thighs on a white plate on a white table.
    Bone In Skin On Oven Roasted Chicken Thighs
  • Flattened and seared chicken breast topped with Arugula salad w/ cherry tomatoes & onions on a white plate. Side view.
    Chicken Paillard ("Pie Yard") - Pounded Chicken Breast
  • Dry Rub Baby Back Ribs Cut With The bones still on and stacked on a wood plate..
    Oven Baked Dry Rub Baby Back Ribs

You May Also Like

If you like Zucchini and Tomato Casserole then check out one of these zucchini heavy recipes:

  • Top view of zucchini noodles with carrots, red onions, red peppers, green onions and cashews on a white plate with chopsticks.
    Asian Zucchini Noodles (Zoodles)
  • Seared and browned caramelized sliced zucchini rounds on a white plate with red pepper flakes lightly garnished. Top view crop to a rectangle.
    Simple Pan Fried Zucchini Rounds
  • Scored, Pan Seared, and Baked Zucchini Halves
  • White plate of seared slices of smoked sausage on a bed of vegetables or diced red peppers, onions, and zucchini. Silverware, napkins, plates in background. Close up.
    Turkey Kielbasa, Onions, Peppers, and Zucchini

Things In My Kitchen:

  • Grater / Zester for grating the Parmesan cheese to a super light consistency.

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Slice of zucchini and tomato casserole pie on a white plate with knife and large casserole in the background.
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Baked Zucchini And Tomato Casserole

Round pie pan filled with sliced zucchini tomatoes with walnuts and cheese baked and crisp. 2 fork in the background. Close up.
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EatSimpleFood.com

This is a simple, healthy, and delicious oven baked zucchini and tomato casserole recipe to make when zucchinis and tomatoes are fresh and abundant in the summer.  Layered zucchini, tomato, walnuts, and Parmesan cheese.

  • Author: beckie
  • Prep Time: 30 minutes
  • Cook Time: 50 minutes
  • Total Time: 1 hour 20 minutes
  • Yield: 6
  • Category: Side Dish
  • Method: Oven
  • Cuisine: International
  • Diet: Vegetarian

Ingredients

  • 3 tablespoon olive oil
  • 4 medium zucchini, sliced thin
  • 3 medium tomatoes, sliced
  • 1 tablespoon garlic, minced
  • ½ cup walnuts, chopped
  • ½ teaspoon dried Italian seasoning
  • ½ teaspoon salt
  • pinch black pepper
  • 1 cup Parmesan Cheese, grated

Instructions

  • Preheat oven to 375F.  Lightly oil 8x8 baking pan.
  • Cook minced garlic over medium heat in a small pan with 1 tablespoon olive oil for 1-2 minutes or until translucent and fragrant.  Set aside.

In baking pan add:

  • a layer of sliced zucchini
  • a layer of sliced tomatoes
  • a drizzle of olive oil
  • sprinkle evenly with salt
  • dash of black pepper
  • ½ the garlic
  • ½ the chopped walnuts
  • sprinkle evenly Italian seasoning
  • ½ the Parmesan cheese
  • Repeat until all ingredients are gone.  This should only take 2 layers but it's ok if you keep going.
  • Coat a piece of aluminum foil with a touch of olive oil.  The olive oil prevents the cheese from sticking to the top of it.
  • Cover with foil.  Cook ~ 50 minutes or until zucchini is soft.
  • Take off cover and brown cheese on low broiler setting for 2-3 minutes (watch it!  you don't want it to burn!)
  • Rest for 10 minutes uncovered before serving.  Happy Eating!  Beckie

Notes

  • Add more salt - There will be a layer of liquid in the bottom of the pan because both zucchini and tomatoes have a lot of water.  The salt will go into the liquid but the top may need some more salt.
  • Add as much Parmesan cheese as you like to this dish!  Some other delicious cheese options are feta cheese, colby jack, and goat cheese.
  • This is an easy zucchini and tomato casserole.  The bottom zucchini will be more done because they have been sitting in the delicious liquid.  The top zucchini will be crisper. If you want them all the same then you will need to lightly boil all the zucchini slices first.

« Fresh Raw Green Chickpeas - Garbanzo Beans
Asian Zucchini Noodles (Zoodles) »

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  1. Dottie says

    September 08, 2024 at 10:43 am

    Can I leave out the cheese and still have a tasty dish?

    Reply
    • Beckie Hemmerling says

      September 08, 2024 at 4:37 pm

      Yes, I think so Dottie! I would add a little extra olive oil or fat and a little more salt and some more nuts and fresh or dried herbs.Thank you, Beckie

      Reply
  2. Cindy says

    October 04, 2025 at 11:01 am

    Turned out wonderful! I used some Lawry's seasoned salt. Great recipe!

    Reply
    • Beckie Hemmerling says

      October 05, 2025 at 11:41 am

      Thanks for the comment Cindy and telling us what you added. Sounds delicious! - Beckie

      Reply

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Hey y'all!

I’m Beckie Hemmerling. I love food and I think of it on a basic level of providing strength & nourishment. Cooking has helped me *try* to figure out life, not just my own, but also other people's. I have cooked through many joys / sorrows and cooking has always been a meditative place through these highs & lows. More background info →

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