Introducing our delicious Keto Zucchini Casserole! This low-carb twist on a classic comfort food features zucchini, cheese, and savory seasonings. Whether you're following a keto lifestyle or just love zucchini, this dish will become your favorite.

Jump to:
- Preparation and cooking overview
- Chef's note
- 🥘 Ingredients for this keto zucchini casserole recipe
- Ingredient substitutions
- Additional ingredients
- Cooking tools required
- Tools substitute options
- How to make Keto Zucchini Casserole: step-by-step guide
- Cooking methods
- Preparation steps
- Cooking instructions
- What to serve with keto zucchini casserole?
- How to make it healthier?
- Time-saving tips
- What can I prepare ahead of time?
- Storage and reheating instructions
- Recipe wrap-up and conclusion
- Frequently asked questions
- 📖 Recipe
Preparation and cooking overview
Did we mention that this Zucchini Casserole Recipe is a breeze to make? All you have to do is bake zucchini slices with a creamy cheese sauce. In 45 minutes, this gourmet meal will be at your dinner table.
Chef's note
Add some Mediterranean twist to your dish by adding sun-dried tomatoes or chopped olives to the cheese sauce. This dish also pairs well with sharp cheddar or crumbled feta, so don't hesitate to experiment!
🥘 Ingredients for this keto zucchini casserole recipe
The ingredients for this Low Carb Casserole are easy to find at any grocery store. Here're what to add to your shopping list:
Ingredient substitutions
If you are looking for a change in the ingredients, here are a few options for you:

Additional ingredients
Here are some optional ingredients to take this cheesy casserole to a new level.
Cooking tools required
To make this Keto Zucchini Casserole recipe, you will need the following kitchen tools:
Tools substitute options

How to make Keto Zucchini Casserole: step-by-step guide
Cooking methods
Preparation steps
- Gather all the ingredients and measure them.
- Dice the onions and mince the garlic cloves.
- Grate the Parmesan and Gruyere cheese.
Cooking instructions
Prepare zucchini slices
- Slice the zucchini into thin, ¼-inch pieces. Try to slice them as evenly as possible for uniform cooking.
- Sprinkle salt on both sides of your zucchini slices.
- Place zucchini slices in a single layer on a paper towel and let them rest for 15 minutes. Then, flip them and let them sit for another 15 minutes on the other side.
- Pat them dry to remove the moisture.
- Lay the zucchini slices in overlapping rows in a baking dish. Once done, set the dish aside for now.


Prepare the cheese sauce
- Melt butter in a cast-iron skillet over medium heat.
- Add your diced onion to the skillet and cook for 2-3 minutes until it softens.
- Stir in minced garlic and cook for an additional 2 minutes.
- Once it's done, pour in the heavy cream and give it a good stir.
- Once the mixture begins to simmer, add half of the grated Parmesan and Gruyere. Stir until the cheeses are fully melted, and the sauce is well combined.



Bake the casserole
- Preheat the oven to 400°F (200°C).
- Carefully pour the simmering cheese sauce over the zucchini slices in the baking dish.
- Cover the dish with foil, pop it in the oven, and bake for 15 minutes.
- After 15 minutes, remove the foil, and sprinkle the remaining Gruyere and Parmesan cheese over the top. Bake for extra 5 minutes or until the cheese is bubbly and golden.
- Finally, remove the dish from the oven. Scoop out a portion and serve hot!

Chef's pro tip
Start by cutting the zucchini into even slices for consistent cooking. Then, generously season them with salt and let them sit for 30 minutes. The salt will work its magic, drawing out the extra moisture from the zucchini, which helps prevent your casserole from becoming too soggy.
What to serve with keto zucchini casserole?
For a complete meal, serve the casserole with a low-carb side dish. The options are:
How to make it healthier?

Time-saving tips
What can I prepare ahead of time?
Storage and reheating instructions
Storage instructions
Our baked zucchini casserole is easy to store and reheat.
Note: Do not freeze your casserole dish; it will lose its texture and flavor.
Storage instructions
Recipe wrap-up and conclusion
This Keto Zucchini Casserole is ideal for a warm, gourmet meal after a tiring day. It's not only quick to prepare but also quite simple! Enjoy it as a standalone main course or a delightful side dish — it complements any meal beautifully.
If you're on the lookout for a healthy casserole recipe, give this one a try. Even if you're a beginner in the kitchen, our easy-to-follow technique guarantees a successful result every time!
Looking for more casserole dishes? Here are some popular ones at CIK:
Frequently asked questions
📖 Recipe

Keto Zucchini Casserole
Ingredients
- 3 medium zucchinis sliced in ¼-inch thick slices
- ½ teaspoon sea salt
- 2 tablespoons butter
- 1 large onion diced
- 2 cloves garlic minced
- ½ cup heavy cream
- ¾ cup Gruyere cheese grated and divided
- ¾ cup Parmesan cheese grated and divided
Instructions
Prepare zucchini slices
- Slice the zucchini into thin, ¼-inch pieces. Try to make them as even as possible for uniform cooking.
- Sprinkle salt on both sides of your zucchini slices.
- Place zucchini slices in a single layer on a paper towel and let them rest for 15 minutes. Then, flip them and let them sit for another 15 minutes on the other side.
- Pat them dry to remove the moisture.
- Lay the zucchini slices in overlapping rows in a baking dish. Once done, set the dish aside for now.
Prepare the cheese sauce
- Melt butter in a cast-iron skillet over medium heat.
- Add your diced onion to the skillet and cook for 2-3 minutes until it softens.
- Stir in minced garlic and cook for an additional 2 minutes.
- Once it's done, pour in the heavy cream and give it a good stir.
- Once the mixture begins to simmer, add half of the grated Parmesan and Gruyere. Stir until the cheeses are fully melted, and the sauce is well combined.
Bake the casserole
- Preheat the oven to 400°F (204°C).
- Carefully pour the simmering cheese sauce over the zucchini slices in the baking dish.
- Cover the dish with foil, pop it in the oven, and bake for 15 minutes.
- After 15 minutes, remove the foil, and sprinkle the remaining Gruyere and Parmesan cheese over the top. Bake for extra 5 minutes or until the cheese is bubbly and golden.
- Finally, remove the dish from the oven. Scoop out a portion and serve hot!
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