There’s something magical about the combination of tender zucchini, gooey melted cheese, and a golden, crispy topping. This Cheesy Zucchini Casserole is the ultimate comfort food – creamy, satisfying, and bursting with fresh flavor.

I first made this dish during an overzealous gardening season, trying to make use of the mountains of zucchini I had harvested. One bite, and it instantly became a family staple – the kind of recipe that’s requested at every gathering. Let’s dive into what makes this casserole so irresistible.

Why You'll Love This Cheesy Zucchini Casserole

Get ready to add this casserole to your regular rotation – it’s that good. Here’s why you’ll fall in love with it:

First, it’s incredibly easy to prepare. With just a handful of everyday ingredients and minimal prep, you can have this dish ready to pop in the oven in no time. Perfect for busy weeknights or when you need a side that steals the show.

The combination of flavors and textures is pure perfection. The zucchini stays tender without being mushy, the cheese adds a rich, creamy element, and the breadcrumb topping provides the perfect crunch.

It’s also a great way to use up extra zucchini. Whether your garden is overflowing or you found a great deal at the farmer’s market, this recipe is a delicious way to make the most of this versatile veggie.

Finally, this dish is crowd-pleasing and versatile. Serve it as a side to roast chicken, or enjoy it as a light vegetarian main. You can even customize the recipe to suit your family’s tastes – more on that later.

Ingredients Notes

The beauty of this casserole lies in its simple ingredients, which come together to create a dish that feels indulgent yet fresh. Here’s a closer look at what you’ll need:

Zucchini: The star of the show! Choose firm, medium-sized zucchini for the best texture and flavor. If they’re particularly large, slice them lengthwise and remove the seeds for a smoother bite.
Cheese: A combination of shredded mozzarella and sharp cheddar creates a melty, flavorful filling. You can substitute Monterey Jack or Gruyère for a twist.
Breadcrumbs: Panko breadcrumbs are my go-to for that irresistible crunch on top. Mix them with a little melted butter for an even more golden crust.
Cream: A touch of heavy cream adds richness without making the casserole feel heavy. You can substitute half-and-half for a lighter option.
Garlic and Onion: These aromatics add depth to the dish. Finely minced garlic and sautéed onion ensure every bite is packed with flavor.

You’ll also need a casserole dish to assemble and bake the dish. A 9x13-inch dish works perfectly to ensure even cooking.

How to Make This Cheesy Zucchini Casserole

This recipe is as easy as layering the ingredients and letting the oven do the hard work. Let’s break it down step by step:

Prep the Zucchini
Begin by slicing the zucchini into thin rounds, about ¼ inch thick. Lightly salt the slices and let them sit for 10-15 minutes to draw out excess moisture. Pat them dry with a paper towel – this step prevents a watery casserole.
Sauté the Aromatics
Heat a skillet over medium heat and add a drizzle of olive oil. Sauté diced onion and minced garlic until softened and fragrant. This step ensures your casserole is infused with a savory, irresistible aroma.
Assemble the Layers
Spread a thin layer of cream at the bottom of your greased casserole dish. Arrange a layer of zucchini slices, followed by a sprinkle of shredded cheese and a spoonful of the sautéed onion mixture. Repeat the layers until all the zucchini is used, finishing with a generous layer of cheese on top.
Add the Topping
In a small bowl, combine breadcrumbs, melted butter, and a pinch of salt. Sprinkle the mixture evenly over the cheese layer for that signature crunchy topping.
Bake to Perfection
Bake the casserole in a preheated oven at 375°F (190°C) for 25-30 minutes, or until the cheese is bubbly and the top is golden brown. Let it rest for 5 minutes before serving – this helps the layers set.

Storage Options

This casserole is just as delicious the next day, making it a great make-ahead option. Here’s how to store it properly:

Refrigerator: Store leftovers in an airtight container for up to 4 days. Reheat in the oven or microwave until warmed through.
Freezer: Assemble the casserole but don’t bake it. Cover tightly with foil and freeze for up to 2 months. When ready to eat, bake straight from frozen, adding an extra 15-20 minutes to the cooking time.
Meal Prep: Portion leftovers into individual containers for easy grab-and-go lunches.

Variations and Substitutions

One of the best things about this recipe is how adaptable it is. Here are some ideas to make it your own:

Add Protein: Turn this into a complete meal by adding cooked chicken, crumbled bacon, or ground turkey between the layers.
Make it Gluten-Free: Swap out the breadcrumbs for gluten-free panko or crushed rice crackers for a similar crunch.
Change the Cheese: Experiment with different cheeses like Parmesan, Fontina, or Pepper Jack for unique flavors.
Vegetarian Twist: Add sliced tomatoes, mushrooms, or bell peppers for a veggie-packed casserole.
Spicy Upgrade: Stir in a pinch of red pepper flakes or diced jalapeños to give the dish a kick.

This Cheesy Zucchini Casserole is the kind of recipe that brings everyone back for seconds. Whether you’re serving it as a side or a star, it’s guaranteed to become a regular at your table. Happy cooking!