Name: Zucchini Casserole with Cheddar, Parmesan, and Panko Breadcrumbs Recipe
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: American
Ingredients: 2 tablespoons butter; 6 ½ cups grated zucchini (about 4-5 medium zucchinis); ½ cup grated onion; 4-5 cloves garlic, minced; 2 teaspoons Italian seasoning; 8 ounces sharp cheddar cheese, grated (white cheddar recommended); 2 cups panko breadcrumbs, divided (use gluten-free if desired); ½ cup mayonnaise; ¼ cup grated Parmesan cheese; Salt and pepper to taste (1 teaspoon salt and ¼ teaspoon black pepper specified)

Jump to Recipe· 4.2 from 12 reviews

I absolutely love sharing my favorite comfort food dishes, and this Zucchini Casserole with Cheddar, Parmesan, and Panko Breadcrumbs Recipe is one that always feels like a warm hug in a bowl. I enjoy how the tender shredded zucchini mingles with sharp cheddar and crunchy panko breadcrumbs, creating a delightful combination of creamy, cheesy, and crispy textures that never fails to please. It’s simple to prepare yet impressive enough to serve any night of the week or for a special occasion.

Why You’ll Love This Zucchini Casserole with Cheddar, Parmesan, and Panko Breadcrumbs Recipe

What really excites me about this zucchini casserole is how the flavors come together so beautifully. The sharp cheddar adds a rich tang, balanced perfectly by the nutty parmesan and the subtle crunch of panko breadcrumbs on top. It’s that contrast between creamy and crisp that I find irresistible and keeps me coming back for seconds. The garlic and Italian seasoning add that homey flavor complexity that feels like every bite tells a cozy story.

Besides being delicious, this casserole is incredibly easy to prepare, which makes it one of my go-to dishes when I want something satisfying without spending a lot of time in the kitchen. The ingredients are straightforward and pantry-friendly, and the use of a cast-iron skillet makes cleanup a breeze. Whether I’m making a hearty weeknight dinner or bringing a crowd-pleaser to a family gathering, this recipe definitely stands out as a reliable and crowd-pleasing choice.

Ingredients You’ll Need

A close-up of a black cast iron skillet filled with a green dish made of small, shredded pieces of zucchini mixed with herbs and light spices, creating a textured, slightly creamy green layer that covers the bottom of the skillet. On top of this green base, near the center front of the skillet, there is a smooth dollop of thick, white cream or sauce with a slightly shiny surface. The skillet rests on a white marbled surface, with a blue cloth featuring white floral patterns blurred in the background. Photo taken with an iphone --ar 4:5 --v 7

To put together this dish, I keep the ingredient list simple but essential. Each one plays a crucial role in building the casserole’s irresistible texture, savory flavor, and inviting color.

Butter: Adds richness and helps sauté the vegetables to perfection.
Grated zucchini: The star vegetable, providing moisture, subtle sweetness, and bulk to the casserole.
Grated onion: Offers a sharp, aromatic depth that enhances the overall flavor.
Minced garlic: Brings a fragrant warmth that pairs beautifully with the Italian seasoning.
Italian seasoning: Adds a fragrant herbal blend that gives the dish its cozy, familiar profile.
Sharp cheddar cheese: Gives a robust cheesy tang that melts into creamy pockets throughout the casserole.
Panko breadcrumbs: Divided into two portions, they add crunch and contrast; plus, gluten-free versions work fantastic too.
Mayonnaise: Provides creamy moisture and helps bind everything together deliciously.
Grated parmesan cheese: Sprinkled on top for a salty, savory finish that crisps up beautifully in the oven.
Salt and pepper: Essential seasonings to elevate all the other flavors.

Directions

Step 1: Preheat your oven to 350 degrees Fahrenheit. Place a large 10 to 12-inch cast-iron skillet (or any oven-safe sauté pan you have) on the stove over medium heat so it’s ready for sautéing.

Step 2: Using a cheese grater, shred the zucchini, onion, and sharp cheddar cheese. Mince the garlic finely or shred it for an even texture that will blend seamlessly in the dish.

Step 3: Add the butter to the skillet and let it melt completely. Once melted, toss in the shredded zucchini, onion, garlic, Italian seasoning, salt, and pepper. Sauté everything together for 4 to 5 minutes, stirring frequently to release moisture from the zucchini and develop flavor.

Step 4: Stir in the mayonnaise, 1 ½ cups of the panko breadcrumbs, and the shredded sharp cheddar cheese. Mix well until everything is evenly combined, then spread the mixture out evenly in the skillet and remove it from heat.

Step 5: Sprinkle the remaining ½ cup of panko breadcrumbs evenly over the top of the zucchini mixture, then dust with the grated parmesan cheese. Transfer the skillet to the oven and bake for 20 to 25 minutes. You’ll want to watch for the edges to turn nicely crispy and the center to be bubbling hot. Serve it warm for the best experience.

Servings and Timing

This Zucchini Casserole with Cheddar, Parmesan, and Panko Breadcrumbs Recipe generously serves six people, making it great for families or small gatherings. It takes about 10 minutes to prep, plus 25 minutes to bake, so your total time investment is roughly 35 minutes including preparation and cooking. There’s no required resting time after baking, though I like to let it cool just a few minutes so it’s easier to serve and the flavors settle perfectly.

How to Serve This Zucchini Casserole with Cheddar, Parmesan, and Panko Breadcrumbs Recipe

A black cast iron pan holds a creamy casserole with two main layers: the top layer is a golden brown, crunchy breadcrumb crust scattered with small green herb leaves, while beneath it is a thick, light yellow mixture with visible bits of herbs and melted cheese, showing a soft and slightly stringy texture. A woman's hand is lifting a spoonful of the casserole, revealing the moist inside with a creamy, smooth texture mixed with the herbs, against a softly blurred blue and white cloth in the background on a white marbled surface. photo taken with an iphone --ar 4:5 --v 7

When I serve this casserole, I love pairing it with light and fresh side dishes that complement the creamy, cheesy richness. A crisp green salad dressed with lemon vinaigrette or a simple tomato and cucumber salad with fresh herbs creates a refreshing balance. Roasted meats or grilled chicken are excellent main dishes to accompany it, turning the meal into a cozy, well-rounded spread.

Presentation-wise, I often sprinkle a few extra fresh herbs like chopped parsley or basil on top just before serving. It adds a pop of color and a lovely fresh aroma. Serving it right out of the skillet at the table gives a rustic and homey vibe which is always a crowd-pleaser.

For beverages, I’m a fan of light white wines like Sauvignon Blanc or Pinot Grigio that cut through the richness nicely. For a non-alcoholic option, sparkling water with a slice of lemon or a lightly brewed iced tea works perfectly. I find this dish ideal for both casual weeknight dinners and special holiday meals, and I always recommend serving it warm to enjoy the full depth of textures and flavors.

Variations

I’ve experimented with a few tasty twists on this zucchini casserole to suit different tastes and dietary needs. If you want to lighten it up, swapping mayo for Greek yogurt adds tang and reduces fat without sacrificing creaminess. For a vegan version, I recommend using dairy-free cheese alternatives and vegan mayo, and substitute the butter with olive oil. Just make sure your panko breadcrumbs are vegan as well.

If you prefer a gluten-free casserole, gluten-free panko breadcrumbs are easy to find and work beautifully for maintaining that irresistible crunchy topping. For a flavor change, try adding some smoked paprika or a pinch of cayenne pepper in the sauté step to introduce a subtle smoky heat. I’ve also baked this casserole in a square baking dish instead of a skillet, which works just fine if you don’t have one handy—just keep an eye on the timing as it may bake a bit quicker or slower.

Storage and Reheating

Storing Leftovers

I always keep leftovers in an airtight container in the refrigerator. The casserole will stay flavorful and safe to eat for up to 3 days. Using glass containers with tight-fitting lids helps maintain the casserole’s texture and keeps unwanted odors out of the fridge. When storing, I recommend portioning out servings to make reheating easier later.

Freezing

This zucchini casserole freezes surprisingly well. To freeze, let it cool completely, then transfer portions or the whole casserole (if using an oven-safe dish with a lid or tightly wrapped in foil and plastic wrap) into the freezer. It will keep well for up to 2 months. When you’re ready to enjoy it, thaw overnight in the fridge for best results before reheating.

Reheating

The best way I’ve found to reheat this casserole is in the oven at around 350 degrees Fahrenheit for 15 to 20 minutes until warmed through and the top regains some of its crispiness. Avoid microwaving if you can, since the topping can become soggy and lose its delightful crunch. If you’re short on time, gently reheating in a skillet over low heat while covered can work, but the oven method is my personal favorite to restore that fresh-baked charm.

FAQs

Can I use frozen zucchini for this casserole?

While fresh zucchini gives the best texture, you can use frozen zucchini if you thaw it reliably and squeeze out all excess moisture before cooking. This prevents the casserole from becoming watery and helps maintain its structure.

Is this casserole suitable for meal prepping?

Absolutely! This casserole holds up well after being refrigerated and reheated, making it a fantastic option for meal prepping lunches or dinners. Just portion it out and store in airtight containers to enjoy throughout the week.

Can I add other vegetables to the casserole?

Definitely! I’ve added sautéed mushrooms, bell peppers, or even some corn for sweetness. Just make sure to adjust the seasoning and cooking time accordingly to maintain the balance of flavors.

What can I use instead of mayonnaise?

If you want to avoid mayonnaise, you can substitute it with plain Greek yogurt for a lighter but still creamy texture, or even sour cream for richness. For a vegan alternative, try vegan mayo or blended silken tofu mixed with a touch of lemon juice.

How do I make the topping extra crispy?

To get a super crispy topping, toss the panko breadcrumbs with a little melted butter before sprinkling over the casserole. This encourages even browning and adds a wonderfully nutty crunch to the dish.

Conclusion

I’m so excited for you to try this Zucchini Casserole with Cheddar, Parmesan, and Panko Breadcrumbs Recipe because it’s one of those dishes that feels effortless and special all at once. Whether you’re cooking for loved ones or just treating yourself, it’s guaranteed to fill your kitchen with comforting aromas and your table with smiles. Grab some fresh zucchini and give this recipe a go—I promise it’ll become a favorite in your rotation just like it is in mine!