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Cheesy Baked Zucchini Casserole

Category: Perfect Side Dishes to Complete Any Meal

Fresh zucchini rounds blend with sharp cheddar and parmesan, all topped by a crisp breadcrumb layer in this classic casserole. The vegetables stay tender and juicy while the cheese melts into every nook, creating a dish that's both cozy and crowd-pleasing. A touch of garlic and olive oil builds flavor, while the crackly topping offers contrast in every bite. Easy to prepare and ready in just under an hour, it's a wonderful use for summer squash or that extra bit of cheese in your fridge. Serve warm for a side or hearty main.

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A woman wearing a chef's hat and apron.
Created By Sarah
Last updated on Sun, 28 Sep 2025 20:45:49 GMT
A close up of a cheesy baked zucchini casserole. Save
A close up of a cheesy baked zucchini casserole. | sarahmeal.com

Cheesy Baked Zucchini Casserole is the ultimate way to turn simple zucchini into something everyone looks forward to. This recipe is all about tender zucchini, nutty cheeses, and a golden crunchy topping. It has become my go-to side whenever I want cozy comfort that comes together fast, with minimal steps and endless room for creativity.

I first made this for a last-minute potluck and was amazed when the entire pan disappeared within minutes. Even my pickiest eater asked for seconds, and now we make it several times each summer.

Ingredients

  • Zucchini: sliced into rounds They bring mild flavor and become melt-in-your-mouth tender Be sure to choose ones that are firm without soft spots for the best texture
  • Sharp cheddar cheese: This is what gives the dish gooey melty richness Choose aged cheddar if you want more punch
  • Grated Parmesan cheese: Adds savory depth and a crispy finish Try grating it fresh from a block for the most flavor
  • Breadcrumbs: Either use panko or homemade for the topping Panko gives a light crunch while homemade breadcrumbs provide a heartier bite
  • Garlic: Minced for an aromatic layer Use fresh cloves for the most robust taste
  • Olive oil: Helps everything brown and boosts flavor Reach for extra virgin for the best results
  • Salt: The key to seasoning every layer Use kosher salt for the cleanest flavor
  • Black pepper: Adds gentle bite and keeps the dish balanced Freshly cracked is always best

Step-by-Step Instructions

Prep the Oven and Dish:
Set your oven to three hundred seventy five degrees Fahrenheit and lightly oil a large baking dish Make sure to get oil into the corners so your casserole does not stick
Season the Zucchini:
Toss sliced zucchini in a big mixing bowl with minced garlic a drizzle of olive oil salt and pepper Stir so every piece is coated evenly This ensures every bite has full flavor
Layer the Zucchini:
Arrange zucchini slices in the baking dish overlapping just a little so they cook evenly and juices do not gather at the bottom
Add the Cheese:
Sprinkle cheddar over the zucchini followed by an even layer of parmesan Make sure to cover the whole surface so every forkful is cheesy
Finish with Topping:
Distribute breadcrumbs on top of the cheese in a thin even layer Gently press down so you get a uniform golden crust as it bakes
Bake to Perfection:
Bake uncovered for twenty five to thirty minutes until cheese is bubbling and the topping turns golden brown Test with a fork to be sure the zucchini is fully tender
Rest and Serve:
Let the casserole cool for several minutes before slicing This helps it hold together and means nobody burns their mouth
A cheesy baked zucchini casserole with a spoon in it. Save
A cheesy baked zucchini casserole with a spoon in it. | sarahmeal.com

Cheesy zucchini and crunchy breadcrumbs might be simple but every time I smell this baking I think of summer evenings laughing at the table My family would always race for the last crispy edge and it remains my favorite part of the entire dish

Storage Tips

Cool the casserole completely before storing Cover the dish with foil or put individual portions into airtight containers and keep in the fridge The dish keeps well for up to three days For best texture reheat in a three hundred fifty degree oven so the topping stays crisp and delicious

Ingredient Substitutions

Swap cheddar for mozzarella if you want a milder touch Gruyere gives a nutty twist Whole wheat breadcrumbs or even crushed crackers work for the topping If you need a gluten free version use gluten free breadcrumbs with great results

Serving Suggestions

Serve with roast chicken or grilled fish for a balanced plate It also makes a great main for vegetarians with a fresh green salad In cooler months I serve it beside tomato soup for double comfort Sometimes I top with a runny fried egg for a unique brunch dish

A cheesy baked zucchini casserole. Save
A cheesy baked zucchini casserole. | sarahmeal.com

Cultural Context

Baked veggie casseroles hold a place in many American and European homes They became popular as a way to feed crowds and could be prepared ahead The mix of cheese with breadcrumbs started in French gratins but evolved into familiar comfort dishes like this one shared at gatherings

Common Recipe Questions

→ How do I avoid soggy casserole?

Pat zucchini slices dry and avoid overlapping too much. The breadcrumb topping also helps soak up extra moisture for a crisper finish.

→ Can I use different cheeses?

Absolutely. Try mozzarella for a milder taste or add Gruyère for a nutty complexity. Parmesan brings a savory edge to any combination.

→ What type of breadcrumbs work best?

Panko brings airy crunch, while homemade or whole wheat add texture and flavor. Gluten-free options work just as well for those who need them.

→ Can this casserole be made ahead?

Yes—assemble everything up to the crumb topping, cover, and refrigerate. Add the topping and bake just before serving for best results.

→ How should leftovers be stored?

Cool completely, then cover or transfer to airtight containers and refrigerate for up to three days. Reheat in the oven to restore crispness.

Cheesy Baked Zucchini Casserole

Layers of fresh zucchini, cheddar, and parmesan finished with crispy crumbs for an irresistible comforting bake.

Preparation Time
20 minutes
Cook Time
30 minutes
Total Duration
50 minutes
Created By: Sarah

Recipe Category: Side Dishes

Level of Difficulty: Simple

Cuisine Style: American-European comfort food

Servings Yield: 6 Portion Size (One large casserole (approximately six servings))

Diet Preferences: Vegetarian-Friendly

What You'll Need

→ Vegetables

Ingredient 01 900 g zucchini, sliced into 5 mm rounds

→ Cheeses

Ingredient 02 150 g aged sharp cheddar cheese, grated
Ingredient 03 50 g Parmesan cheese, freshly grated

→ Topping

Ingredient 04 60 g panko breadcrumbs or homemade fresh breadcrumbs

→ Aromatics & Seasoning

Ingredient 05 2 cloves garlic, finely minced
Ingredient 06 2 tablespoons extra virgin olive oil
Ingredient 07 3/4 teaspoon kosher salt
Ingredient 08 1/2 teaspoon freshly cracked black pepper

How to Make It

Instruction 01

Preheat oven to 190°C. Lightly brush a large baking dish, approximately 33 x 23 cm, with a thin layer of olive oil to prevent sticking.

Instruction 02

In a spacious mixing bowl, combine sliced zucchini with minced garlic, one tablespoon olive oil, salt, and pepper. Toss thoroughly until all pieces are evenly coated.

Instruction 03

Layer seasoned zucchini rounds in the prepared dish, overlapping slightly to ensure even cooking and avoid excess moisture accumulation.

Instruction 04

Sprinkle grated cheddar evenly over the zucchini, followed by Parmesan, ensuring full coverage for optimal melt and flavor.

Instruction 05

Distribute breadcrumbs in a thin, even layer over the cheese. Drizzle with remaining tablespoon of olive oil and gently press down for uniform crispness.

Instruction 06

Transfer dish to the preheated oven and bake for 25 to 30 minutes, or until the surface is deeply golden and cheese is bubbling. Insert a fork to confirm the zucchini is tender throughout.

Instruction 07

Allow casserole to cool for 5 minutes before serving to help it set and prevent burns. Portion and serve hot.

Additional Tips

  1. Pat zucchini dry with paper towels to reduce excess moisture and prevent a soggy texture.
  2. Opt for freshly grated cheese instead of pre-shredded for a smoother melt and better flavor.
  3. Customize with fresh herbs such as thyme or parsley, or a pinch of smoked paprika in the crumb for extra complexity.
  4. Leftovers keep well refrigerated for up to 3 days; reheat in a moderate oven to restore crispness.

Essential Tools

  • Mixing bowl
  • Large baking dish (approx. 33 x 23 cm)
  • Sharp chef’s knife
  • Cutting board
  • Grater
  • Measuring spoons

Allergy Details

Always review ingredient labels for allergens, and consult a professional if you're unsure.
  • Contains milk (cheese); may contain gluten (breadcrumbs); contains wheat if using standard breadcrumbs.

Nutritional Breakdown (per serving)

These nutritional details are for informational purposes and shouldn't replace medical advice.
  • Calories: 210
  • Fat Content: 12 grams
  • Carbohydrate Content: 13.5 grams
  • Protein Content: 11 grams