Zucchini Casserole Recipe

This zucchini casserole is a delightful side dish that can easily steal the spotlight at any meal. It's a flavorful blend of tender zucchini, savory parmesan cheese, and heart smart bisquick, creating a hearty and healthy addition to your culinary repertoire. It's simple to prepare and sure to impress with its golden brown appearance and satisfying texture.

Zucchini Casserole Recipe

Most of the ingredients in this recipe are probably already in your pantry. The ones you may need to pick up from the supermarket are zucchini, heart smart bisquick, and parmesan cheese. Zucchini is a summer squash that's versatile and offers numerous health benefits. Heart smart bisquick is a baking mix that's a healthier alternative to the regular one, and parmesan cheese is a hard, granular cheese that adds a sharp and umami flavor to the dish.

Ingredients for Zucchini Casserole

Zucchini: A versatile vegetable that adds a unique texture and mild flavor to the dish.

Heart smart bisquick: A baking mix that helps bind the casserole together while keeping it light and healthy.

Onion: Enhances the flavor of the dish with its sharp and sweet taste.

Egg whites: Gives the casserole a fluffy texture.

Egg: Works as a binder in the casserole, helping all the ingredients stick together.

Olive oil: Used for greasing and adds a smooth, rich flavor to the dish.

Parmesan cheese: Offers a rich and tangy flavor that complements the mild taste of zucchini.

Salt and black pepper: Enhances the overall flavor of the casserole.

Parsley: Adds a fresh and vibrant taste to the dish.

One reader, Galen Baugh says:

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This zucchini casserole recipe is a game-changer! The flavors are so rich and satisfying. It's a perfect way to use up all that zucchini from the garden. The dish is easy to make and tastes absolutely delicious. I highly recommend giving it a try!

Galen Baugh

Key Techniques for Making Zucchini Casserole

How to prepare the zucchini: Wash the zucchini thoroughly and trim off the ends. Cut the zucchini into small cubes or slices, depending on your preference.

How to mix everything together: In a large mixing bowl, combine the heart smart bisquick, chopped onion, egg whites, egg, olive oil, parmesan cheese, kosher salt, black pepper, and parsley. Mix until well combined.

How to spray the baking dish: Using a cooking spray, evenly coat a 9 x 13-inch baking dish to prevent the casserole from sticking.

How to bake the casserole: Place the prepared mixture into the baking dish and spread it out evenly. Bake in the preheated oven at 350 degrees F until the casserole turns golden brown and a toothpick inserted in the center comes out clean, which should take approximately 45 to 50 minutes.

How to cut the casserole into pieces: Once the casserole is baked and cooled slightly, cut it into 12 equal pieces using a sharp knife.

How To Make Zucchini Casserole

Zucchini provides an invigoratingly fresh taste that is perfect when combined with eggs, cheese, and herbs for this zucchini casserole. Serve it warm!

Cooking: 50 minutes
Total: 50 minutes



  • 4cupszucchini,grated
  • cupsHeart Smart Bisquick
  • cuponion,minced
  • 3egg whites,large, beaten
  • 1egg,large, beaten
  • 1tbspolive oil
  • ¼cupparmesan cheese,grated
  • 1tspkosher salt and fresh black pepper,to taste
  • 1tspparsley


  1. Preheat oven to 350 degrees F.

  2. Mix everything together in a bowl.

  3. Spray 9 x 13-inch baking dish with cooking spray and pour mixture.

  4. Bake until golden brown and a toothpick inserted in the center comes out clean, approximately 45 to 50 minutes.

  5. Cut into 12 equal pieces.


  • Calories: 90.26kcal
  • Fat: 2.64g
  • Saturated Fat: 0.85g
  • Trans Fat: 0.00g
  • Monounsaturated Fat: 1.23g
  • Polyunsaturated Fat: 0.33g
  • Carbohydrates: 12.39g
  • Fiber: 0.55g
  • Sugar: 1.31g
  • Protein: 4.72g
  • Cholesterol: 15.44mg
  • Sodium: 269.22mg
  • Calcium: 113.49mg
  • Potassium: 201.62mg
  • Iron: 1.44mg
  • Vitamin A: 17.08µg
  • Vitamin C: 7.87mg

Expert Tip for Perfecting Your Zucchini Casserole

To ensure even cooking and a well-baked casserole, make sure to slice your zucchini into even pieces. Uneven pieces may result in some parts of the casserole being undercooked while others are overcooked. Additionally, when mixing the ingredients together, take your time to ensure that the Bisquick, egg whites, and egg are fully incorporated. This will help create a smooth, consistent texture throughout the casserole.

Time-Saving Tips for Preparing This Recipe

Prep ahead: Chop and measure all the ingredients the night before to save time on the day of cooking.

Use kitchen tools: Utilize kitchen gadgets like a food processor or mandoline to quickly and efficiently prepare the zucchini and onions.

One-pot wonder: Consider using a single pot or pan for both mixing and baking to minimize cleanup time.

Double batch: Make a larger quantity and freeze individual portions for quick and easy meals in the future.

Team effort: Enlist the help of family members or friends to assist with the preparation, making the process quicker and more enjoyable.

Substitute Ingredients For Zucchini Casserole Recipe

  • zucchini - Substitute with yellow squash: Yellow squash has a similar texture and flavor to zucchini, making it a great substitute in this casserole recipe.

  • heart smart bisquick - Substitute with whole wheat flour and baking powder: Whole wheat flour and baking powder can be used as a healthier alternative to bisquick, providing a similar texture and structure to the casserole.

  • onion - Substitute with shallots: Shallots have a milder and sweeter flavor compared to onions, adding a subtle and delicate taste to the casserole.

  • egg whites - Substitute with silken tofu: Silken tofu can be blended to a smooth consistency and used as a substitute for egg whites, providing a creamy texture to the casserole.

  • egg - Substitute with flaxseed meal and water: A mixture of flaxseed meal and water can replace eggs, adding moisture and binding the ingredients together in the casserole.

  • olive oil - Substitute with avocado oil: Avocado oil has a similar flavor profile to olive oil and can be used as a healthier alternative in the casserole recipe.

  • parmesan cheese - Substitute with nutritional yeast: Nutritional yeast provides a cheesy flavor and can be used as a dairy-free substitute for parmesan cheese in the casserole.

  • kosher salt - Substitute with sea salt: Sea salt can be used as a substitute for kosher salt, providing a similar level of saltiness to the casserole.

  • fresh black pepper - Substitute with white pepper: White pepper can be used as a milder alternative to black pepper, adding a subtle heat to the casserole.

  • parsley - Substitute with cilantro: Cilantro can be used as a substitute for parsley, providing a fresh and citrusy flavor to the casserole.

Presentation Tips for a Delightful Zucchini Casserole

  1. Elevate the zucchini: Gently layer the zucchini casserole in individual ceramic ramekins to create an elegant and refined presentation.

  2. Garnish with fresh herbs: Sprinkle finely chopped chives and parsley over the top of the casserole for a pop of color and a burst of fresh flavor.

  3. Incorporate edible flowers: Adorn the zucchini casserole with delicate nasturtium or borage flowers to add a touch of sophistication and a hint of floral notes.

  4. Use a ring mold for plating: Place a ring mold on the serving plate and carefully pack the zucchini casserole mixture inside for a neat and professional presentation.

  5. Drizzle with a balsamic reduction: Create an artistic drizzle pattern on the plate using a balsamic reduction to add a touch of sweetness and a beautiful visual element to the dish.

  6. Serve with a side of microgreens: Accompany the zucchini casserole with a small bundle of vibrant microgreens to add a fresh and delicate element to the plate.

  7. Add a sprinkle of smoked paprika: Dust a small amount of smoked paprika around the edge of the plate for a subtle smoky flavor and a visually appealing touch.

  8. Serve on a bed of quinoa: Present the zucchini casserole on a quinoa bed for a wholesome and visually striking plating option.

Essential Kitchen Tools for Making Zucchini Casserole

  • Cutting board: A flat board used for cutting and preparing ingredients.
  • Chef's knife: A versatile knife used for chopping, slicing, and dicing.
  • Baking dish: A rectangular or square dish used for baking casseroles, lasagnas, and other baked dishes.
  • Mixing bowl: A bowl used for mixing ingredients together.
  • Whisk: A kitchen tool used for blending and mixing ingredients.
  • Measuring cups and spoons: Used for accurately measuring ingredients for recipes.
  • Oven: Used for baking and roasting dishes.
  • Cooking spray: Used for greasing baking dishes and pans to prevent sticking.
  • Toothpick: Used for checking the doneness of baked goods by inserting into the center and checking if it comes out clean.
  • Spatula: Used for spreading and smoothing the casserole mixture in the baking dish.

Storing and Freezing Zucchini Casserole for Later

  • Let the zucchini casserole cool completely to room temperature before storing or freezing. This will prevent condensation from forming and making the casserole soggy.

  • To store in the refrigerator, cover the casserole dish tightly with plastic wrap or aluminum foil. Alternatively, transfer the cooled casserole to an airtight container. It will keep in the fridge for up to 4 days.

  • For longer storage, freeze the zucchini casserole. Cut the casserole into individual portions and wrap each piece tightly in plastic wrap, followed by a layer of aluminum foil. Place the wrapped portions in a freezer-safe container or freezer bag, removing as much air as possible before sealing.

  • Label the container or bag with the date and contents for easy identification.

  • Frozen zucchini casserole will maintain its best quality for up to 3 months. However, it will remain safe to eat beyond that time, but the texture and flavor may start to deteriorate.

  • To reheat the refrigerated casserole, cover it with foil and bake in a preheated 350°F (175°C) oven until heated through, about 20-30 minutes.

  • For frozen casserole, thaw it overnight in the refrigerator before reheating. If reheating directly from frozen, increase the baking time to 45-60 minutes, or until the casserole is hot and bubbly.

  • If you want to maintain the crispy texture of the top layer, remove the foil for the last 5-10 minutes of reheating.

The Best Ways to Reheat Zucchini Casserole Leftovers

  • Preheat your oven to 350°F (175°C). Place the leftover zucchini casserole in an oven-safe dish and cover it with aluminum foil. Bake for 15-20 minutes, or until heated through. Remove the foil for the last 5 minutes to crisp up the top if desired.

  • Microwave individual portions of the casserole in a microwave-safe dish. Cover the dish with a damp paper towel to prevent the casserole from drying out. Heat on high for 1-2 minutes, or until heated through. Stir the casserole halfway through the reheating process to ensure even heating.

  • For a crispy top, reheat the casserole in a skillet on the stovetop. Add a small amount of olive oil or butter to the skillet and heat over medium heat. Add the leftover casserole and cook, stirring occasionally, until heated through and the top is crispy.

  • If you have an air fryer, you can use it to reheat the zucchini casserole. Preheat the air fryer to 350°F (175°C). Place the leftover casserole in the air fryer basket and cook for 5-7 minutes, or until heated through and crispy on top.

  • For a quick and easy reheating method, use a toaster oven. Preheat the toaster oven to 350°F (175°C). Place the leftover casserole on a toaster oven tray and heat for 10-15 minutes, or until heated through and crispy on top.

Interesting Trivia About Zucchini Casserole

Zucchini casserole is a versatile dish that can be customized with various ingredients such as cheese, tomatoes, or herbs. It can be served as a side dish or a main course, making it a great option for a family meal.

Budget-Friendly: Is Zucchini Casserole Cost-Effective?

The zucchini casserole recipe is highly cost-effective for a household. With affordable ingredients like zucchini, heart smart bisquick, and eggs, it offers a budget-friendly option for feeding a family. The use of olive oil and parmesan cheese adds flavor without breaking the bank. This dish is a great way to incorporate vegetables into the meal, making it both economical and nutritious. The approximate cost for a household of 4 people is around $10, making it a wallet-friendly choice. Overall Verdict: 9/10

Is This Zucchini Casserole Healthy?

This zucchini casserole recipe has some healthy elements, but there's room for improvement. Let's break it down:

Healthy aspects:

  • Zucchini is a nutrient-dense vegetable, low in calories and high in fiber, vitamins, and minerals
  • Using egg whites reduces the cholesterol content
  • Olive oil is a heart-healthy fat
  • Parmesan cheese provides calcium and protein in moderation

Less healthy aspects:

  • Bisquick mix often contains processed ingredients and added sodium
  • The recipe calls for a significant amount of salt, which could be reduced

To make this recipe even healthier, consider the following suggestions:

  • Replace the Bisquick mix with whole wheat flour or almond flour for added fiber and nutrients
  • Increase the proportion of zucchini to boost the vegetable content
  • Use more egg whites and fewer whole eggs to further reduce cholesterol
  • Experiment with different herbs and spices, such as garlic, basil, or thyme, to add flavor without relying on salt
  • Include other vegetables like bell peppers, carrots, or spinach to enhance the nutritional value and variety of the dish
  • Top the casserole with a sprinkle of nuts or seeds for added crunch and healthy fats

Editor's Opinion: Why I Love This Zucchini Casserole

The zucchini casserole recipe seems simple and easy to prepare, but it lacks depth and flavor. To enhance the dish, consider adding additional herbs and spices such as garlic, thyme, or oregano for a more robust flavor profile. Incorporating a variety of cheeses like mozzarella or cheddar can also elevate the dish. Additionally, adding a layer of sliced tomatoes on top before baking can bring a burst of freshness. Overall, with a few tweaks, this recipe has the potential to be a delicious and satisfying dish.

Enhance Your Zucchini Casserole Recipe with These Unique Side Dishes:

Mashed Potatoes: Creamy garlic mashed potatoes with a hint of parmesan cheese and chives
Garlic Bread: Warm and crispy garlic breadsticks brushed with herb-infused olive oil
Caesar Salad: Fresh romaine lettuce tossed in a tangy Caesar dressing with homemade croutons and shaved parmesan cheese

Alternative Recipes Similar to Zucchini Casserole

Stuffed Bell Peppers: Combine ground beef, rice, tomatoes, and spices to stuff bell peppers, then bake until tender and juicy.
Mango Salsa Chicken: Grill or bake chicken breasts and top with a refreshing salsa made with mango, red onion, cilantro, and lime juice.
Butternut Squash Soup: Simmer butternut squash, onions, and garlic in broth, then blend until smooth and creamy for a comforting fall soup.
Banana Bread: Mash ripe bananas and mix with flour, sugar, and spices to create a moist and flavorful loaf of banana bread.

Appetizers and Desserts to Complement Your Zucchini Casserole

Stuffed Mushrooms: Delight your guests with these savory stuffed mushrooms, filled with a flavorful mixture of cream cheese, garlic, and herbs. The perfect bite-sized appetizer to kick off any meal.
Spinach and Artichoke Dip: Indulge in the creamy and cheesy goodness of this spinach and artichoke dip, served with crispy tortilla chips or warm bread. A crowd-pleasing appetizer that will leave everyone wanting more.
Chocolate Mousse: Indulge in a rich and velvety chocolate mousse, topped with a dollop of whipped cream and a sprinkle of cocoa powder. This decadent dessert is the perfect way to satisfy your sweet tooth.
Apple Crisp: Savor the warm and comforting flavors of apple crisp, with tender baked apples and a crunchy oat topping. Pair it with a scoop of vanilla ice cream for a delightful contrast of textures and temperatures.

Why trust this Zucchini Casserole Recipe:

This zucchini casserole recipe is a trusted choice for a wholesome meal. The combination of fresh zucchini and heart-smart Bisquick creates a satisfying texture, while the addition of onion and parmesan cheese infuses rich flavors. The use of olive oil adds a touch of healthy fats, and the blend of egg whites and egg ensures a light, fluffy consistency. With a sprinkle of kosher salt and fresh black pepper for seasoning, and a hint of parsley for freshness, this recipe promises a delightful dining experience.

Want to share your own zucchini casserole recipe or discuss tips and variations? Join the conversation in the Recipe Sharing forum!
Can I substitute the Bisquick with another type of flour?
Yes, you can substitute the Bisquick with a mixture of flour, baking powder, and a pinch of salt. Use 1 cup of all-purpose flour, 1½ teaspoons of baking powder, and a ¼ teaspoon of salt for every cup of Bisquick.
Can I add other vegetables to the casserole?
Absolutely! Feel free to add other vegetables like bell peppers, mushrooms, or spinach to the casserole for added flavor and nutrition.
Can I use whole eggs instead of just egg whites?
Yes, you can use whole eggs instead of just egg whites. Using whole eggs will add richness and flavor to the casserole.
Can I make this casserole ahead of time?
Yes, you can prepare the casserole ahead of time and refrigerate it before baking. Simply cover the dish with plastic wrap and store it in the refrigerator for up to 24 hours before baking.
Can I freeze the zucchini casserole?
Yes, you can freeze the zucchini casserole. After baking, allow it to cool completely, then wrap it tightly in plastic wrap and aluminum foil before placing it in the freezer. It can be stored in the freezer for up to 2-3 months. To reheat, thaw it in the refrigerator overnight and then bake it in a preheated oven until heated through.

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