Zucchini Casserole is a no-fuss dish that is delicious as a vegetarian entrée or a side dish for any meal.
This recipe is very simple, calling for just three main ingredients, zucchini, tomatoes, and a touch of onion. Adding a crunchy Panko breadcrumb topping with parmesan cheese gives for the perfect finishing touch. Zucchini really is the main star of this dish!
A Versatile Casserole Recipe
Easy Baked Zucchini has been a go-to side dish for us forever. It’s effortless and so delicious. I wanted to create a zucchini casserole that was light but flavorful and made the veggies the star of the dish (and not loaded down with bread etc).
Ingredients
ZUCCHINI
The zucchini for this recipe doesn’t need to be peeled (or salted). Simply rinse and slice.
TOMATOES
I like using Roma tomatoes in this recipe, they add great flavor but hold up well to baking and aren’t watery. You can use any ripe tomato, try to choose one with a similar diameter to the zucchini you’re using.
TOPPING
I love a crisp topping over this casserole. A combination of panko bread crumbs and parmesan cheese is the perfect addition. Fresh herbs are added after baking for lots of flavor.
This baked zucchini casserole goes well with simple summertime fare and makes a nice substitute for a tossed salad. Serve it with grilled chicken breasts, hamburgers, or sausages.
How to Make Zucchini Casserole
- Cook onion in olive oil until tender. Toss zucchini with olive oil and seasonings.
- Alternate zucchini and tomatoes in a casserole dish (similar to how you would stack a ratatouille). Bake 20-25 minutes.
- Prepare topping & sprinkle over top.
- Bake until veggies are soft & topping is golden brown!
Tips for Casserole
- Zucchini casserole tastes best eaten fresh from the oven. Because zucchini is so watery, it really doesn’t take very well to freezing. You’re likely to find it becomes just too mushy to be appetizing.
- If you want your veggies softer but your topping is browned, loosely place a small square of foil over top to keep it from browning too much.
- Leftovers can be refrigerated for up to 3 days and reheated in a microwave.
More Summer Favorites
- Easy Squash Casserole
- Greek Salad
- Easy Fresh Gazpacho
- Easy Layered Ratatouille
- Garden Fresh Bruschetta
Did you enjoy this Zucchini Casserole? Be sure to leave a comment and a rating below!
Zucchini Casserole
Equipment
Ingredients
- 1 pound Roma tomatoes sliced ¼” thick
- 1 ½ pounds zucchini sliced ½” thick
- ½ teaspoon Italian seasoning
- 1 ½ tablespoons olive oil
- 1 clove garlic minced
- salt and pepper to taste
- fresh basil and parsley for serving
Topping
- 1 tablespoon olive oil
- ½ onion finely chopped
- ¼ cup bread crumbs
- 2 tablespoons melted butter
- ¼ cup shredded Parmesan cheese
- ⅔ cup shredded mozzarella cheese
Instructions
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Preheat oven to 375°F.
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For the topping, cook onion in olive oil until tender, about 5 minutes. Set aside.
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Slice tomatoes and place on paper towels to absorb liquid, about 2 to 3 minutes.
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Combine zucchini, Italian seasoning, olive oil and garlic in a bowl. Toss well and season with salt and pepper.
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Alternate zucchini and tomatoes in stacks. Place the stacks on their sides in a 2 ½ qt baking dish or 9x13 pan. Cover with foil and bake 25 minutes.
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Meanwhile, combine all topping ingredients in a small bowl, including the onions from above, and mix well.
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Remove foil from casserole and top with the topping mixture. Bake uncovered for an additional 20 minutes or until zucchini is tender.
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Sprinkle with fresh herbs and serve warm.
Notes
Nutrition Information
Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.
Course Side Dish
Cuisine American
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yum
Great job,loved this dish
Made this for the first time tonite. I halved the recipe but still used a 7 x 11 dish…reason being I used both a green and yellow zucchini along with the tomatoes. Made for a nice color mix. I didn’t measure anything. I used the old fashion way of “add till it feels good”. So I used a bit more onion, Italian seasoning, pepper, cheeses, bread crumbs, butter. I feel the sauce on bottom of dish is a must. This was a very tasty dish and the hubs is still raving about it.
When I make it again, I may add cooked ground beef or put the zucchini on top of spaghetti.
Thank you Holly for another great recipe!
So glad you and your husband both love it Moonie, this would be great with spaghetti!
I’m not sure if I did something wrong, but the bottom of the pan was really watery. The onions overpowered the topping. I think if there were some tweaks this could be a really good recipe, for me personally.
I’m sorry this happened to your casserole, Steph! Next time you can try patting the zucchini with paper towel to remove excess moisture at the same time as the tomato slices, that might help!
This dish is very yummy! I halved it and baked in an 8×8 pyrex pan using sliced SanMarzano tomatoes. I didn’t have mozza, so used Gouda cheese. I didn’t add the fresh herbs, but it was good without it. At the end I broiled it a bit to brown the topping.
Where do the onions go?
The onion is added to the topping in step 6.
Excellent dish. I’ve made this before and am making this today for our main dish for supper.
This recipe is awesome! I brought it to a party and it was loved by everyone..This recipe is a keeper!
I read through this twice and could not find the oven temperature to bake at. Poorly written.
The first instruction in the reicpe is Preheat oven to 375°F. Enjoy!
Made this for a side dish for breakfast. Wonderful recipe! Loved by whole family.
Just made this today, it was delicious I did use your tip to use a small can of tomato sauce in the bottom of the dish. My SO isn’t fond of zucchini or cooked tomatoes, but likes fresh tomatoes and he really liked this dish.
This recipe has been updated for better results, but we have been asked for the original recipe. Here it is!
¼ cup onion, finely chopped
1 Tablespoon olive oil
1 ½ pounds zucchini
½ teaspoon Italian seasoning
1 ½ cups cherry tomatoes, whole
salt & pepper to taste
Topping
½ cup panko bread crumbs
2 Tablespoons butter
¼ cup fresh parmesan cheese
1 Tablespoon fresh parsley
1 Tablespoon fresh basil
1) Preheat oven to 350F.
2) Heat a large skillet over medium heat. Cook onion in olive oil until tender, about 5 minutes.
3) Slice zucchini ½” thick. If you prefer softer zucchini, cut thinner.
4) Add zucchini and Italian seasoning. Cook an additional 3-4 minutes until just slightly softened.
5) Place zucchini in a 2 quart casserole dish. Add in cherry tomatoes. Season with salt and pepper.
6) Combine all Topping ingredients in a small bowl and mix well. Sprinkle over zucchini mixture.
7) Bake casserole 30-35 minutes or until zucchini reaches desired doneness.
This recipe looked and tasted amazing! Great side dish recipe for any occasion. I adjusted the fat content as I am on a low fat diet and it still had lots of flavour. I also used a large zucchini from a friend’s garden and cut the bigger slices in half to arrange in dish with tomatoes. This recipe is a keeper and will make again for sure!
Thanks Gayle! So glad you love the casserole!
This recipe is delicious! I made it for the first time the other night and it disappeared in a flash!
Looking forward to trying
Typically, this goes the French name of Ratatouille. I, personally add large mushroom caps sliced as a layer, and shredded cheese (gruyere is fabulous, provolone, etc.) on top!
How many cups of sliced zucchini is the 1 1/2 lbs.? …..4 cups sliced?…And I purchased the items for this recipe before it was updated . Can I still use the mini tomatoes? Or should they be in equal size to the sliced zucchini?… meaning the Roma’s
Thanks
1 ½ pounds is approximately 5 heaping cups of sliced zucchini. The zucchini casserole recipe itself was not updated. We do recommend that you use tomatoes similar in size to the zucchini. Hope that helps, Debra!
The photo and introduction look and sound great, but they don’t seem to match up with the printed directions. The intro talks about plum tomatoes, the recipe about cherry. In addition, the intro has you alternating slices of zucchini and squash yet the recipe has you first adding all the zucchini and then the tomatoes on top. Can you explain the discrepancies? Actually, both ways sound yummy.
I only discovered your blog last week and have already made one recipe–and loved it–and have plans to make a couple more this week. So glad I found you!!
I apologize for the confusion, the recipe was recently updated for improved flavor and texture and the updates were not displaying. The post has been updated.