
Remember those summer days when zucchini seemed to grow on trees? We all have that garden friend or neighbor who gifts us an abundance of this versatile veggie. Well, get ready to transform that bounty into something truly magical with this incredible Shredded Zucchini Casserole. It’s the kind of comforting, flavorful dish that feels like a warm hug on a plate, and trust me, it’s so simple, you’ll be making it again and again.
Why You’ll Love Shredded Zucchini Casserole
- Fast: Perfect for busy weeknights, this casserole comes together in a flash.
- Easy: Even if you’re a beginner in the kitchen, you can totally nail this recipe.
- Giftable: Make a double batch and freeze one – it makes a thoughtful meal to share with friends or family.
- Crowd-pleasing: With its cheesy goodness and savory flavor, everyone from picky eaters to seasoned foodies will devour it.
Ingredients
Gather these simple ingredients, and let’s get cooking!
- 8 cups coarsely shredded zucchini: The star of our show! Don’t worry about peeling; the skins add lovely texture.
- 1/2 teaspoon salt: This helps draw out excess moisture from the zucchini.
- 1 tablespoon olive oil: For sautéing our aromatics.
- 1 cup finely chopped onion: Adds a wonderful sweetness and depth of flavor.
- 4 cloves garlic, minced: Because, well, garlic makes everything better!
- 4 large eggs: Our binder to hold all this deliciousness together.
- 1/2 teaspoon freshly ground black pepper: For a little kick.
- 1 1/2 cups shredded mozzarella cheese: For that irresistible gooey, melty texture.
- 1 1/2 cups shredded sharp Cheddar cheese: Because cheese is life, and cheddar brings the tangy goodness.
- 3/4 cup grated Parmesan cheese, divided: A sprinkle of salty, nutty flavor that elevates everything.
- 2/3 cup Italian seasoned panko breadcrumbs: For a delightful crunchy topping.
- 3 tablespoons butter, melted: To get our breadcrumbs perfectly golden.
- Chopped chives to taste, for garnish: A little pop of color and fresh oniony flavor to finish.
How to Make Shredded Zucchini Casserole
Ready? Let’s get this easy casserole in the oven!
- Prep your oven and dish: First things first, preheat your oven to a cozy 375 degrees F (190 degrees C). Then, lightly grease a 2-quart rectangular baking dish. This little step prevents any sticking and makes for easier cleanup.
- Drain the zucchini: In a large bowl, toss your shredded zucchini with the 1/2 teaspoon of salt. Let it sit in a colander for about 15 minutes. This is a crucial step to remove excess water, which can make your casserole soggy. After it’s had a little soak, give it a good squeeze with a clean kitchen towel to get out as much liquid as possible. I find this makes a world of difference!
- Sauté the aromatics: While the zucchini is draining, heat the olive oil in a large skillet over medium heat. Add your finely chopped onion and cook until it’s soft and looks a bit see-through, which usually takes about 4 minutes. Then, toss in your minced garlic and cook for just one more minute until it’s wonderfully fragrant.
- Mix the casserole magic: Now, grab that large bowl again. Whisk together the eggs and pepper. Add the well-drained zucchini, the sautéed onion and garlic mixture, the mozzarella cheese, the Cheddar cheese, and 1/2 cup of the Parmesan cheese. Give it all a good stir until everything is wonderfully combined.
- Bake it up (Part 1): Pour this glorious mixture into your prepared baking dish and spread it out into an even layer. Pop it into the preheated oven and bake, uncovered, for 20 minutes.
- Prepare the crunchy topping: While the casserole is baking, grab a small bowl. Combine the panko breadcrumbs with the melted butter. Stir in the remaining 1/4 cup of Parmesan cheese until everything is nicely coated.
- Bake it up (Part 2): After the first 20 minutes, carefully take the casserole out of the oven. Sprinkle the buttery breadcrumb mixture evenly over the top. Return it to the oven and bake for another 10 to 15 minutes, or until the topping is beautifully golden brown and crisp.
- Garnish and serve: Once it’s out of the oven, sprinkle with fresh chopped chives. Serve warm and watch it disappear! It’s a fantastic side dish that pairs beautifully with almost anything, like our Grilled Chicken Creamy Pasta Bowl or even as a hearty side to some Easy Chicken Scampi Rice.

Substitutions & Additions
Feel free to get creative and make this casserole your own!
- Cheese: Swap out the mozzarella or cheddar for other melty cheeses like Monterey Jack, Gruyere, or even a bit of pepper jack for a little heat.
- Herbs: Fresh parsley, dill, or basil would be lovely additions to the main mixture.
- Veggies: Cooked, crumbled bacon or finely diced bell peppers added with the onions would be delicious.
- Spices: A pinch of nutmeg or a dash of garlic powder can add another layer of flavor.
Tips for Success
A few pointers to ensure your casserole is absolutely perfect!
- Squeeze that zucchini! I can’t stress this enough. Getting as much moisture out as possible is key to a great texture.
- Don’t overcook the garlic: Garlic can burn quickly, so keep an eye on it when you’re sautéing.
- Prep ahead: You can shred the zucchini, chop the onions, and mince the garlic a day in advance. Store them separately in airtight containers in the refrigerator.
- Make it ahead: You can assemble the casserole (up to the point of adding the breadcrumb topping) a day in advance. Cover and refrigerate. When ready to bake, let it sit at room temperature for about 30 minutes, add the topping, and bake as directed, possibly adding a few extra minutes to the initial bake time.
How to Store Shredded Zucchini Casserole
Leftovers are the best! Here’s how to store them:
- Once cooled, store any leftover casserole in an airtight container in the refrigerator for up to 3-4 days.
- To reheat, you can microwave individual portions or gently reheat the entire casserole in a 350°F (175°C) oven until warmed through. The topping might not be as crisp after refrigeration, but it will still be delicious!
FAQs
Can I make this ahead of time?
Yes! You can assemble the casserole up to the breadcrumb topping stage and refrigerate it for up to 24 hours. Let it come to room temperature for about 30 minutes before baking, and add a little extra baking time if needed.
Why is my zucchini casserole watery?
The most common reason for a watery casserole is not squeezing out enough moisture from the shredded zucchini. Make sure to really press out the liquid!
Can I freeze this casserole?
Yes, you can freeze the baked and cooled casserole. Wrap it well in plastic wrap and then foil. It should last in the freezer for up to 2-3 months. Thaw in the refrigerator overnight and reheat as directed.
What can I serve with this casserole?
This casserole is incredibly versatile! It makes a fantastic side dish for grilled chicken, fish like our Quick Lemon-Garlic Butter Salmon, pork chops, or even just a simple salad. It’s hearty enough to be a vegetarian main course too!
If you enjoyed this recipe, be sure to follow us on Pinterest for more delicious ideas!

Shredded Zucchini Casserole
Equipment
- Colander
- Clean kitchen towel
- Large skillet
- large bowl
- Small bowl
- 2-quart rectangular baking dish
Ingredients
- 8 cups 8 cups coarsely shredded zucchini Don't worry about peeling; the skins add lovely texture.
- 0.5 tsp 1/2 teaspoon salt This helps draw out excess moisture from the zucchini.
- 1 tbsp 1 tablespoon olive oil For sautéing our aromatics.
- 1 cup 1 cup finely chopped onion Adds a wonderful sweetness and depth of flavor.
- 4 cloves 4 cloves garlic, minced Because, well, garlic makes everything better!
- 4 large 4 large eggs Our binder to hold all this deliciousness together.
- 0.5 tsp 1/2 teaspoon freshly ground black pepper For a little kick.
- 1.5 cups 1 1/2 cups shredded mozzarella cheese For that irresistible gooey, melty texture.
- 1.5 cups 1 1/2 cups shredded sharp Cheddar cheese Because cheese is life, and cheddar brings the tangy goodness.
- 0.75 cup 3/4 cup grated Parmesan cheese, divided A sprinkle of salty, nutty flavor that elevates everything.
- 0.67 cup 2/3 cup Italian seasoned panko breadcrumbs For a delightful crunchy topping.
- 3 tbsp 3 tablespoons butter, melted To get our breadcrumbs perfectly golden.
- Chopped chives to taste, for garnish A little pop of color and fresh oniony flavor to finish.
Instructions
- Step 1: First things first, preheat your oven to a cozy 375 degrees F (190 degrees C). Then, lightly grease a 2-quart rectangular baking dish. This little step prevents any sticking and makes for easier cleanup.
- Step 2: In a large bowl, toss your shredded zucchini with the 1/2 teaspoon of salt. Let it sit in a colander for about 15 minutes. This is a crucial step to remove excess water, which can make your casserole soggy. After it's had a little soak, give it a good squeeze with a clean kitchen towel to get out as much liquid as possible. I find this makes a world of difference!
- Step 3: While the zucchini is draining, heat the olive oil in a large skillet over medium heat. Add your finely chopped onion and cook until it's soft and looks a bit see-through, which usually takes about 4 minutes. Then, toss in your minced garlic and cook for just one more minute until it's wonderfully fragrant.
- Step 4: Now, grab that large bowl again. Whisk together the eggs and pepper. Add the well-drained zucchini, the sautéed onion and garlic mixture, the mozzarella cheese, the Cheddar cheese, and 1/2 cup of the Parmesan cheese. Give it all a good stir until everything is wonderfully combined.
- Step 5: Pour this glorious mixture into your prepared baking dish and spread it out into an even layer. Pop it into the preheated oven and bake, uncovered, for 20 minutes.
- Step 6: While the casserole is baking, grab a small bowl. Combine the panko breadcrumbs with the melted butter. Stir in the remaining 1/4 cup of Parmesan cheese until everything is nicely coated.
- Step 7: After the first 20 minutes, carefully take the casserole out of the oven. Sprinkle the buttery breadcrumb mixture evenly over the top. Return it to the oven and bake for another 10 to 15 minutes, or until the topping is beautifully golden brown and crisp.
- Step 8: Once it's out of the oven, sprinkle with fresh chopped chives. Serve warm and watch it disappear! It’s a fantastic side dish that pairs beautifully with almost anything, like our Grilled Chicken Creamy Pasta Bowl or even as a hearty side to some Easy Chicken Scampi Rice.
