There's nothing quite like the cozy, savory goodness of a Cheesy Zucchini Casserole fresh from the oven. With tender zucchini slices layered in a creamy, cheesy sauce and topped with golden, crispy breadcrumbs, this dish is as comforting as it is delicious.

I first discovered this gem while searching for a way to use up an overabundance of garden zucchini. What started as a simple experiment has become a staple at every family gathering. It’s easy to prepare, irresistibly tasty, and perfect as a main dish or a side.

Why You’ll Love This Cheesy Zucchini Casserole

Get ready to fall in love with the ultimate combination of comfort food and fresh veggies. This Cheesy Zucchini Casserole checks all the boxes for a crowd-pleasing dish.

First and foremost, it’s a breeze to make. With just a few simple ingredients and steps, you can whip up a dish that tastes like it came straight from a gourmet kitchen.

It’s also incredibly versatile. Serve it as a hearty vegetarian main course or pair it with grilled chicken or steak for a delicious side. The flavors are rich and satisfying, while the zucchini keeps it feeling light and fresh.

Plus, this recipe is a fantastic way to sneak vegetables onto the plate for picky eaters. The creamy, cheesy layers will have everyone coming back for seconds (or thirds!).

Finally, the dish is highly customizable. Whether you want to add more vegetables, swap out the cheese, or tweak the spices, this recipe adapts beautifully to your preferences.

Ingredients Notes

The beauty of this recipe lies in its simplicity, but each ingredient plays a key role in achieving the perfect flavor and texture. Here’s what you’ll need:

Zucchini: The star of the show! Choose medium-sized zucchinis with smooth skin and firm flesh. You’ll want to slice them thinly for even cooking and a tender texture.
Cheese: A combination of cheddar and Parmesan creates a rich, cheesy flavor. Feel free to experiment with mozzarella, gouda, or Monterey Jack for variety.
Breadcrumbs: For the topping, use plain or Italian-seasoned breadcrumbs. Mixing them with a bit of butter ensures they turn golden and crispy in the oven.
Eggs and Cream: These create a silky custard base that holds the casserole together. Substitute half-and-half for cream if you prefer a lighter option.
Onions and Garlic: Sautéed onions and minced garlic add depth and aroma, making each bite irresistibly flavorful.

For equipment, you’ll need a mandoline or sharp knife for slicing the zucchini evenly, as well as a large baking dish to assemble the casserole.

How to Make Cheesy Zucchini Casserole

Creating this Cheesy Zucchini Casserole is easier than you might think. Let me guide you through the process step by step.

Prepare the Zucchini: Start by preheating your oven to 375°F (190°C). Wash the zucchini and slice them into ¼-inch rounds. Lay the slices on a clean kitchen towel and sprinkle with salt. This helps draw out excess moisture, so your casserole doesn’t turn watery. Let them sit for 10-15 minutes, then pat dry.
Sauté the Aromatics: In a skillet over medium heat, melt a bit of butter and sauté diced onions until translucent. Add minced garlic and cook until fragrant, about 1 minute.
Make the Cheese Mixture: In a mixing bowl, whisk together eggs, heavy cream, and a pinch of salt, pepper, and Italian seasoning. Stir in the cheddar cheese and half of the Parmesan.
Assemble the Casserole: Grease a baking dish and arrange a layer of zucchini slices. Pour a bit of the cheese mixture over the zucchini, then repeat the layers until all ingredients are used.
Add the Topping: Mix breadcrumbs with melted butter and the remaining Parmesan cheese. Sprinkle this mixture evenly over the top of the casserole.
Bake: Place the casserole in the oven and bake for 30-35 minutes, or until the top is golden and bubbling. Let it rest for 5-10 minutes before serving to allow the layers to set.

Storage Options

If you’re lucky enough to have leftovers, this casserole stores beautifully. Here’s how to keep it fresh:

Refrigeration: Store the casserole in an airtight container for up to 3 days. Reheat individual portions in the microwave or oven until warmed through.
Freezing: To freeze, let the casserole cool completely, then wrap it tightly in plastic wrap and foil. It will keep for up to 3 months. Thaw overnight in the fridge before reheating.
Reheating Tips: For the best results, reheat in the oven at 350°F (175°C) to retain the crispy topping.

Variations and Substitutions

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

Add Protein: Mix in cooked ground beef, shredded chicken, or crumbled bacon for a heartier dish.
Switch Up the Veggies: Swap out some zucchini for thinly sliced yellow squash, eggplant, or mushrooms.
Make It Gluten-Free: Use gluten-free breadcrumbs or crushed gluten-free crackers for the topping.
Try Different Cheeses: Experiment with smoked gouda, pepper jack, or even blue cheese for a unique twist.
Spice It Up: Add a pinch of red pepper flakes or chopped jalapeños for a little heat.

Don’t be afraid to get creative! This casserole is a blank canvas for your culinary inspiration.

Final Thoughts

This Cheesy Zucchini Casserole is a celebration of comfort, flavor, and simplicity. Whether you're feeding a crowd, looking for a new way to enjoy zucchini, or simply craving something cozy, this dish will not disappoint.

So go ahead, preheat that oven, and get ready to enjoy a dish that’s sure to become a new favorite in your recipe collection.