Easy Zucchini Au Gratin (Keto, Gluten-Free)

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.

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

Author: Lisa MarcAurele

5 from 12 votes

An easy gratin recipe that’s keto friendly and takes just minutes to prepare. It’s a healthier alternative to the high carb potato au gratin recipes.

Recipe Video (Click on Image to Play)

Prep Time10 mins

Cook Time28 mins

Total Time38 mins

Course: Side Dish

Cuisine: American

Print Pin Review Recipe

Servings 8 people

Calories 152kcal

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

US Customary – Metric

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

I used dairy free cheese which didn’t melt well in the oven. Real cheese should melt and get gooey while baking.

Low Carb Sweeteners | Keto Sweetener Conversion Chart

Nutrition

Serving: 1cup | Calories: 152kcal | Carbohydrates: 2g | Protein: 7g | Fat: 12g | Saturated Fat: 7g | Cholesterol: 37mg | Sodium: 224mg | Potassium: 165mg | Fiber: 0g | Sugar: 1g | Vitamin A: 470IU | Vitamin C: 9.5mg | Calcium: 233mg | Iron: 0.4mg

Additional Info

Net Carbs: 2 g | % Carbs: 5.6 % | % Protein: 19.4 % | % Fat: 75 %

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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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