Summer is all about enjoying fresh and vibrant flavors, and what better way to do it than with this mouthwatering Zucchini Casserole recipe? Packed with nutritious ingredients and bursting with flavor, this dish is a must-try for anyone looking to embrace a healthy yet indulgent meal. With a combination of tender zucchini, aromatic onion, and a cheesy Bisquick topping, this casserole is the perfect side dish anytime, but especially for these hot summer months.

Just like tomatoes, people always seem to have an abundance of zucchini and ask me for ways to use it up. Classic zucchini bread is delicious, but you can only eat so much of it, you know. I’m thrilled to offer another alternative to add to your recipe box.
These Parmesan Zucchini Sticks are a delicious and fun side or snack to make with it, too!

And if you are looking for a main dish, then this Ground Beef Zucchini Casserole is perfect, AND it’s Keto-friendly, too!

SAVE THIS ZUCCHINI CASSEROLE RECIPE TO YOUR FAVORITE PINTEREST BOARD!

The Benefits of Zucchini

Whether you grow your own or pick some up at the grocery store, zucchini is low in calories and rich in essential nutrients, making it an excellent addition to a balanced diet. From promoting digestion to supporting weight loss, zucchini offers tons of advantages for your overall health.

Ingredients for Summer Zucchini Casserole

To make this easy zucchini casserole, you will need just a handful of ingredients:

4 large eggs
½ cup vegetable oil
3 cups thinly sliced fresh zucchini
1 cup thinly sliced onion
1 ½ cups shredded cheddar cheese
1 cup Bisquick
1 tablespoon fresh parsley (or 1 teaspoon dried parsley)
½ teaspoon kosher salt
¼ teaspoon black pepper

How to make Zucchini Casserole

Now that you have gathered all the ingredients, let’s dive into the step-by-step instructions for making this delicious casserole:

Preheat oven to 375° F and prepare a 9 X 13-inch baking dish by spraying it with cooking spray.
Slice the zucchini with a sharp knife. Remove any excess water by pressing them with a paper towel.
In a large bowl, combine the eggs and oil, and mix well. Add in the zucchini slices, onions, cheese, Bisquick, parsley, salt, and pepper, and thoroughly combine.
Pour the zucchini mixture into the prepared baking dish and bake for 30 minutes or until golden brown on top. Serve the casserole warm and enjoy the delightful flavors of summer!

That’s it- the perfect main dish for dinner or serve it as an easy side dish with your favorite main, like grilled chicken breasts or this Asian-Marinated Roast Pork Tenderloin.

Recipe Variations

To make your zucchini casserole even more flavorful, consider incorporating the following things:

Experiment with different herbs: Aside from parsley, you can try using other herbs, such as thyme or rosemary, to add some more great flavor to the dish.
Add a kick of spice: If you enjoy spicy flavors, consider adding a pinch of chili flakes or a dash of hot sauce to the casserole for an extra zing.
Customize with additional vegetables: Feel free to add your favorite vegetables to the mix. Consider bell peppers, cherry tomatoes, sliced mushrooms, spinach, or even corn to complement the flavors beautifully.
Opt for a different cheese: While cheddar cheese works wonderfully in this recipe, you can experiment with other cheeses, such as mozzarella cheese, Swiss cheese or Gruyere, for a more intense flavor.

Easy side dish casserole made with cheese, zucchini and Bisquick.

How to Store Leftovers

Let your casserole dish cool to room temperature, then store it in an airtight container in the fridge for 3-5 days.

Can you Freeze Zucchini Casserole?

This recipe freezes well! Wrap it tightly with a layer of saran wrap and then a layer of aluminum foil. Freeze it for up to a month.

To reheat, let it thaw in the refrigerator overnight, then warm in a 350-degree oven until warm through.

More Zucchini Recipes

Still looking for ways to use up your zucchini?

With fresh lemon flavor, these sweet Lemon Zucchini Muffins are a great way to use fresh garden zucchini and don’t take long to make.
Cornmeal Breaded Zucchini Chips are a delicious vegetable snack or side dish! These zucchini slices have a light cornmeal coating seasoned with garlic and Parmesan cheese.
These baked Zucchini Sticks, coated in two different kinds of bread crumbs, Italian herbs, and Parmesan cheese, make a quick and easy side dish, appetizer, or even dinner. Serve plain, with your favorite marinara or ranch dressing.
Elevate your dinner game with delicious and healthy Mushroom and Onion Stuffed Zucchini! This delightful recipe combines the earthy flavors of mushrooms and sweet onions inside a tender zucchini boat.

Zucchini Casserole