An easy zucchini au gratin recipe that’s keto friendly and takes just minutes to prepare. It’s a healthier alternative to the high carb potato recipes.
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A traditional au gratin dish is topped with breadcrumbs, along with cheese. Then it’s cooked until perfectly golden brown. But using zucchini and skipping the crispy topping makes it a fantastic low carb side dish.
Now, when most people think of au gratin, the dish that comes to mind is potatoes. But potatoes, in my opinion, are at the top of the list for being one of vegetables to avoid. That’s because the starch from potatoes can rapidly metabolize into sugar.
But I’m here to tell you that it’s not necessary to make a traditional-tasting au gratin dish with potatoes. Just sub it out for a healthier veggie like I do in this keto zucchini au gratin.
When replacing potatoes with a low-starch veggie, it sometimes help to partially cook the veggie first. And then, you can bake the low-starch veggie in the au gratin pan.
But before getting into the recipe, I want to tell you why I love cooking with this specific veggie.
Is Zucchini Keto Friendly?
You bet! Zucchini is one of the best low carb vegetables. One medium sized zucchini has about 6 grams of carb of which 2 grams are fiber. And since you would never eat a whole one, a serving should only add one or two grams net
If you’re following a ketogenic lifestyle, it’s definitely one of the best low-carb veggies for a keto diet. So without further ado, let’s get cooking….
How to make a keto zucchini au gratin
If you want to feed your hungry family or a dinner party of 8, here’s what you’ll need:
- 2 tablespoons of butter or ghee (clarified butter)
- a couple cloves of garlic
- either a tablespoon of onion flakes or 3 tablespoons of chopped fresh raw onion
- a half-cup of almond milk if you want a lighter dairy footprint (or make it richer by adding heavy cream)
- 2 cups of shredded cheddar cheese (non-dairy cheddar cheese can work too)
- And last but not least, 2 medium zucchinis sliced.
To make it, the first thing you need to do is in an oven-proof skillet, over medium heat, melt the butter. Then, add the garlic and onion and cook until fragrant, about 2 to 3 minutes.
At this point, you’ll want to add the almond milk (or cream). Place on simmer and continue to let it cook until it starts to boil. But don’t turn the stove top off just yet.
At this point, you’ll want to delicately and slowly add half the shredded cheese. Then stir until it melts.
Next, stir in the veggie. All the slices should be soaked and covered in the sauce. Stir frequently and cook on simmer setting for another 5 minutes.
Now it’s time to add the rest of the cheese. And the final step in preparing this zucchini gratin is baking it in the oven at 400 for about 20 minutes until the top is browned.
Oh yeah, and one more thing: enjoy!
Final cooking tips
I tested out a dairy-free cheese in the recipe. But it didn’t melt well in the oven. I’d be curious if any of you have solutions to that.
The great thing about this zucchini au gratin dish is it’s gluten-free as there’s no bread crumbs. But I suppose seasoned crushed pork rinds could be used make it more of an authentic style dish and still keep it keto. You can also used crumbs from toasted keto bread.
Other Low Carb Zucchini Recipes
I use the veggie many of my recipes. Turkey Zucchini meatballs? Check. Zucchini nachos? Nailed it.
I’ve also transformed the nutrient-dense, low-calorie veggie into a healthier french fry, pizza slices, and cheese wedges. And I’ve of course created several low-carb pasta recipes with it using zoodles.
Looking for another recipe to use up your zucchini? Check out my zucchini chicken casserole.
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Zucchini Gratin
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Ingredients
- 2 tablespoons butter or ghee
- 2 cloves garlic minced
- 1 tablespoon onion flakes or 3 tablespoons chopped fresh
- 1/2 cup almond milk or heavy cream for richer sauce
- 2 cups cheddar cheese shredded
- 2 medium zucchini sliced
Low Carb Sweeteners | Keto Sweetener Conversion Chart
Instructions
- In oven proof skillet over medium heat, melt the butter. Then add the garlic and onion and cook until browned and fragrant.
- Add the almond milk (or cream) and simmer until it starts to boil. Slowly add in 1 cup of the shredded cheese and stir until melted.
- Stir in the sliced zucchini until all are covered with the sauce. Stir and cook for another 5 minutes.
- Sprinkle remaining 1 cup of cheddar cheese on top. Then bake in 400°F oven until top is browned (about 20 minutes).
Notes
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Nutrition
Additional Info
Note on Nutritional Information
Nutritional information for the recipe is provided as a courtesy and is approximate only. We cannot guarantee the accuracy of the nutritional information given for any recipe on this site. Erythritol carbs are not included in carb counts as it has been shown not to impact blood sugar. Net carbs are the total carbs minus fiber.
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Lisa MarcAurele has been creating keto friendly recipes since 2010. She enjoys experimenting in the kitchen to create low sugar foods that taste like high carb favorites!
carol paez says
Okay. So I am guessing the garlic cloves are to be chopped, minced, or crushed?
Lisa MarcAurele says
Minced. I’ll go in and add that.
Linda says
Oh yum! Can’t believe it’s a keto-friendly. This is definitely a recipe that will be on repeat weekly.
paleoglutenfreeguy says
Love it when you can make dishes (especially veggie dishes) both healthful and indulgent. This looks like total comfort food!
Zuzana says
A perfect addition to our list. So many Zucchinis growing in the garden.
Jean Choi says
I’ve been swimming in zucchini these days so this is such a perfect recipe! What a great idea.
Hope says
Loving this low carb version of gratin. This is going on my menu for the weekend!
Erin says
I always eat the entire batch of potatoes au gratin and then just want to sleep the rest of the day! This is the right recipe for me. 🙂
Annemarie says
This looks delicious! My kids don’t normally enjoy zucchini, but the cheese might be just the thing to encourage them. 🙂
ChihYu says
Zucchini and delicious, melty cheese! I’m in! And the prep is simple!
Megan Stevens says
I LOVE the heavy cream version! 😉 My favorite veggie too! Thanks for this great recipe!
Raia Todd says
I absolutely love this. It’s such a great way to get my kids to eat zucchini! Haha.
Cynthia | What A Girl Eats says
I seem to always buy zucchini every week. It’s so versatile! I can’t wait to make this!
Joni Gomes says
I’m a sucker for a cheesy gratin! Love this healthy spin on it with the zucchini! Very summer appropriate!
Thom Davis says
I think this would be a good substitute for a high carb side dish for Thanksgiving. Since zucchini aren’t seasonal right now, do you think frozen would work? I could also see this working with yellow squash (fresh or frozen) maybe.
Lisa MarcAurele says
Yellow squash works great too. I’m not sure about frozen zucchini as it can be a lot softer than fresh. But you can certainly give it it a try.
monika says
Your wrote: (I haven’t personally used Daiya, the popular brand of vegan cheese substitute. If you do decide to use it please leave a comment on this post and let me know how it turns out and if you have to adjust the serving size.) BUT later in the post you wrote that your family used dairy-free cheese…
So which is it and which cheese did YOU use?
Lisa MarcAurele says
I have used Daiya, but I like the So Delicious brand better. The first comment is an error.
Annette Gamble says
I read that you were trying to avoid dairy because of inflammation. Have you tried goat milk and goat cheese. My daughter was allergic to cow dairy but not goat milk, butter and cheese. It melts just like cow cheese.
Lisa says
Yes. Goat milk doesn’t have the same reaction and I’m pretty sure it’s because it’s an A2 casein in goat’s milk whereas most cow milk is A1.