This Keto Zucchini Casserole is a delightful dish that combines cheesy goodness with the freshness of zucchini. Perfect for family dinners or as a side at gatherings, this casserole shines with its rich flavors and satisfying textures. Low in carbs yet high in flavor, it’s an excellent choice for those looking to enjoy a healthy meal without sacrificing taste.
Why You’ll Love This Recipe
- Deliciously Cheesy: This casserole features a blend of mozzarella, cheddar, and Parmesan cheeses, creating a creamy texture that everyone will love.
- Low Carb Delight: With only 9 grams of carbs per serving, it fits perfectly into a keto diet while still being hearty and filling.
- Easy to Prepare: Quick prep and straightforward instructions make this dish accessible for cooks of all levels.
- Versatile Serving Options: Serve it as a side dish or main course; it pairs well with grilled chicken or beef.
- Kid-Friendly Flavor: The cheesy taste and soft texture make this casserole appealing to both kids and adults alike.
Tools and Preparation
To make your cooking experience smooth, gather the necessary tools before you start. Having everything in place helps streamline the process.
Essential Tools and Equipment
- Non-stick cooking spray
- Cheesecloth or kitchen towel
- Mixing bowl
- Baking dish (8” x 8”)
- Whisk
Importance of Each Tool
- Non-stick cooking spray: Prevents sticking, ensuring easy removal of the casserole from the dish.
- Cheesecloth or kitchen towel: Essential for squeezing out excess moisture from the zucchini, which enhances the texture of the casserole.
- Mixing bowl: Allows for easy combining of ingredients without mess.
- Baking dish: Provides even cooking, ensuring all parts of your casserole are perfectly baked.

Ingredients
This Keto Zucchini Casserole is cheesy, buttery, and packed with low carb zucchini!
Fresh Ingredients
- 4 cups shredded zucchini (about 4 medium zucchini)
- 1/4 tsp salt
- 1/2 cup diced yellow onion
- 2 tbsp minced garlic
Dairy Ingredients
- 2 eggs (beaten)
- 1 cup shredded mozzarella cheese
- 1/2 cup shredded cheddar cheese
- 3/4 cup grated Parmesan cheese (divided)
Topping Ingredients
- 1/2 cup crushed beef rinds or Parmesan cheese crisps
- 3 tbsp butter
How to Make Keto Zucchini Casserole
Step 1: Preheat the Oven
Preheat your oven to 375°F (190°C). Prepare an 8” x 8” baking dish by spraying it with non-stick cooking spray to ensure easy release after baking.
Step 2: Drain the Zucchini
Place half of the shredded zucchini in a clean cheesecloth or cotton kitchen towel. Twist it into a pouch and squeeze over the sink to remove excess water. Repeat with the remaining zucchini.
Step 3: Combine Ingredients
In a mixing bowl, combine the drained zucchini, diced onion, minced garlic, beaten eggs, mozzarella cheese, cheddar cheese, and 1/2 cup of Parmesan cheese. Mix thoroughly until all ingredients are well combined.
Step 4: Bake the Casserole Base
Transfer the mixture into your prepared baking dish. Bake in the preheated oven for about 20 minutes until set.
Step 5: Prepare the Topping
While your casserole base is baking, melt butter in a small saucepan. In a separate bowl, combine crushed beef rinds (or Parmesan crisps) with remaining Parmesan cheese and melted butter. Mix until well combined.
Step 6: Add Topping
After baking for 20 minutes, remove the casserole from the oven. Sprinkle the buttered topping evenly over the top. Return it to bake for another 5-8 minutes until golden brown and crispy.
Step 7: Serve
Once done baking, take your Keto Zucchini Casserole out of the oven. Allow it to cool slightly before serving. Season with salt and pepper to taste. Enjoy!
How to Serve Keto Zucchini Casserole
This Keto Zucchini Casserole is deliciously cheesy and makes for a versatile dish. Here are some creative serving suggestions to elevate your meal.
As a Standalone Dish
- Enjoy the casserole on its own for a satisfying low-carb meal that’s rich in flavor and nutrients.
With Fresh Salad
- Pair it with a light salad of mixed greens, cucumbers, and tomatoes dressed with olive oil and vinegar for a refreshing contrast.
Accompanied by Grilled Chicken
- Serve alongside grilled chicken breast for an extra protein boost that complements the creamy texture of the casserole.
Topped with Avocado
- Add sliced avocado on top for creaminess and healthy fats, enhancing both flavor and nutrition.
With Cauliflower Rice
- Serve over fluffy cauliflower rice for a filling, low-carb alternative to traditional grains.
How to Perfect Keto Zucchini Casserole
To ensure your Keto Zucchini Casserole is always a hit, follow these simple tips.
- Drain zucchini well: Removing excess moisture prevents the casserole from becoming soggy.
- Use fresh cheese: Freshly shredded cheese melts better than pre-shredded varieties, enhancing texture and taste.
- Season generously: Don’t skimp on salt and pepper; they bring out the flavors of the ingredients.
- Experiment with spices: Add herbs like thyme or oregano for an extra layer of flavor that complements the zucchini.
- Adjust baking time: Keep an eye on the casserole during baking to achieve your desired level of crispness on top.
- Let it rest: Allowing the casserole to cool slightly before serving helps it set up nicely for cleaner slices.
Best Side Dishes for Keto Zucchini Casserole
This Keto Zucchini Casserole pairs wonderfully with various sides. Here are some great options to consider:
- Garlic Butter Shrimp
Lightly sauté shrimp in garlic butter for a seafood twist that pairs beautifully with zucchini. - Roasted Brussels Sprouts
Toss Brussels sprouts in olive oil, salt, and pepper, then roast until crispy for a crunchy side. - Sautéed Spinach
Quickly sauté spinach with garlic for a nutritious, vibrant side that complements your casserole perfectly. - Avocado Salad
Create a fresh salad using diced avocados, tomatoes, and lime juice for a zesty kick alongside your dish. - Cauliflower Mash
Make creamy mashed cauliflower as a comforting alternative to traditional mashed potatoes. - Broccoli Slaw
Mix shredded broccoli stems with carrots and a tangy dressing for a crunchy slaw that adds texture to your meal. - Stuffed Bell Peppers
Bake bell peppers filled with ground turkey or beef and seasonings for a hearty option alongside the casserole. - Zucchini Noodles
Serve spiralized zucchini lightly tossed in olive oil as an additional nod to your main ingredient!
Common Mistakes to Avoid
When making your Keto Zucchini Casserole, it’s easy to run into a few common pitfalls. Here are some mistakes to avoid for the best results.
- Not draining zucchini properly: Failing to remove excess water can make your casserole soggy. Always squeeze out as much moisture as possible from the shredded zucchini.
- Using too much cheese: While cheese is delicious, adding too much can lead to a greasy texture. Stick to the recommended amounts for a balanced flavor.
- Skipping the baking time: Rushing the cooking process can prevent your casserole from setting correctly. Allow it to bake fully for the suggested time.
- Ignoring seasoning: A bland casserole won’t impress anyone. Season with salt and pepper before serving to enhance the flavors.
- Using low-quality ingredients: The quality of your cheese and other ingredients affects taste. Choose fresh, high-quality products for the best outcome.

Storage & Reheating Instructions
Refrigerator Storage
- Store leftover Keto Zucchini Casserole in an airtight container.
- It will last for up to 3-4 days in the refrigerator.
Freezing Keto Zucchini Casserole
- Wrap portions tightly in plastic wrap or aluminum foil.
- Freeze for up to 2-3 months for optimal freshness.
Reheating Keto Zucchini Casserole
- Oven: Preheat to 350°F (175°C) and heat for about 15-20 minutes until warmed through.
- Microwave: Place a portion on a microwave-safe plate and heat for 1-2 minutes, checking frequently.
- Stovetop: Use a skillet over medium heat, adding a splash of broth or water, and cover until heated through.
Frequently Asked Questions
Here are some frequently asked questions about making Keto Zucchini Casserole.
Can I use other vegetables in my Keto Zucchini Casserole?
Yes! Feel free to add bell peppers, spinach, or mushrooms for extra nutrition and flavor.
How can I make my Keto Zucchini Casserole spicier?
Add red pepper flakes or diced jalapeños into the mixture before baking for a spicy kick.
Is this recipe suitable for meal prep?
Absolutely! This Keto Zucchini Casserole is perfect for meal prep and can be made ahead of time.
How do I know when my Keto Zucchini Casserole is done?
It should be golden brown on top and firm in the center. A knife inserted should come out clean.
Final Thoughts
This Keto Zucchini Casserole is not only cheesy and buttery but also incredibly versatile. You can customize it by adding different vegetables or spices to suit your taste. Give this recipe a try; it’s sure to become a favorite side dish!

Keto Zucchini Casserole
- Total Time: 45 minutes
- Yield: Serves 8
Description
Keto Zucchini Casserole is a deliciously cheesy, low-carb dish that’s perfect for family dinners or as a crowd-pleasing side at gatherings. This comforting casserole brings together the rich flavors of mozzarella, cheddar, and Parmesan cheese with fresh zucchini for a satisfying meal without compromising on taste. It’s easy to prepare, making it accessible for cooks of all experience levels. With only 9 grams of carbs per serving, this casserole fits seamlessly into any low-carb lifestyle while delivering big on flavor. Whether enjoyed as a main course or paired with grilled chicken or beef, this Keto Zucchini Casserole is sure to impress everyone at the table.
Ingredients
- 4 cups shredded zucchini
- 1/2 cup diced yellow onion
- 2 tbsp minced garlic
- 2 eggs (beaten)
- 1 cup shredded mozzarella cheese
- 1/2 cup shredded cheddar cheese
- 3/4 cup grated Parmesan cheese (divided)
- 1/2 cup crushed beef rinds or Parmesan cheese crisps
- 3 tbsp butter
Instructions
- Preheat your oven to 375°F (190°C) and spray an 8” x 8” baking dish with non-stick cooking spray.
- Drain the shredded zucchini by placing it in a kitchen towel and squeezing out excess moisture.
- In a mixing bowl, combine drained zucchini, diced onion, minced garlic, beaten eggs, mozzarella cheese, cheddar cheese, and half of the Parmesan cheese. Mix well until combined.
- Transfer the mixture into the prepared baking dish and bake for about 20 minutes until set.
- While baking, melt the butter and combine it with crushed beef rinds (or Parmesan crisps) and remaining Parmesan cheese.
- Remove the casserole from the oven after 20 minutes and top with the buttered mixture. Return to bake for another 5-8 minutes until golden brown and crispy.
- Let cool slightly before serving.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Category: Main
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 serving
- Calories: 218
- Sugar: 3g
- Sodium: 350mg
- Fat: 15g
- Saturated Fat: 8g
- Unsaturated Fat: 6g
- Trans Fat: 0g
- Carbohydrates: 9g
- Fiber: 2g
- Protein: 12g
- Cholesterol: 98mg