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Zucchini Gratin

cheesy zucchini gratin on wooden spoon.

Easy, cheesy, and a huge hit with the whole family! This keto zucchini gratin is the perfect side dish to use up all that summer squash.

Easy, cheesy, and a huge hit with the whole family! This keto zucchini gratin is the perfect side dish to use up all that summer squash.

Yield 6
Prep Time 10 minutes
Cook Time 35 minutes
Rest Time 45 minutes
Total Time 1 hour 30 minutes


  • 4 medium zucchini
  • 1/2 tablespoon kosher salt
  • 1 cup heavy cream
  • 2 ounces cream cheese
  • 2 cups shredded cheddar, divided
  • 1/2 cup shredded gruyere, divided
  • 1 teaspoon garlic powder
  • 1 teaspoon onion powder
  • ½ teaspoon ground mustard
  • pepper, to taste


  1. Slice the zucchini into ¼ inch rounds. Place on a paper towel lined baking sheet and sprinkle with the salt. Let set for 45 minutes to remove moisture from the zucchini.
  2. Preheat oven to 400 degrees. 
  3. While the zucchini is setting, make the cheese sauce by adding the cream and cream cheese to a small sauce pan over low heat. Stir until the cream cheese has melted and the mixture is hot. 
  4. Add the garlic powder, onion powder, and ground mustard and whisk to combine.
  5. Remove from the heat and stir in 1 ½ cups of cheddar and ¼ cup of Gruyere. Whisk until smooth and creamy.
  6. Pat zucchini dry, wiping off any large amounts of salt, and place half of the zucchini in a greased 8x8 baking dish. Sprinkle with ground pepper. 
  7. Spoon half of the cheese sauce over the zucchini and spread to coat. 
  8. Place remaining zucchini in the dish, top with the remaining cheese sauce, and sprinkle with the remaining cheddar and Gruyere. 
  9. Bake uncovered for 30-35 minutes. Let set for 5 minutes before serving.


It's important to salt the zucchini and let it set for awhile to remove some of the moisture. If you skip this step, your zucchini gratin will be much more watery.

This amount of salt does season the casserole nicely. If you're sensitive to salt, you may want to wipe it off the individual zucchini slices where you can see it. As is, we think this is perfectly salted and flavorful but we admittedly like a fair amount of salt in our foods.

You may use a mixture of zucchini and yellow crookneck squash, if preferred.

Nutrition Information:

Yield: 6 Serving Size: 1
Amount Per Serving: Calories: 386Total Fat: 34gSaturated Fat: 20gTrans Fat: 1gUnsaturated Fat: 11gCholesterol: 102mgSodium: 673mgCarbohydrates: 8gNet Carbohydrates: 6gFiber: 2gSugar: 4gProtein: 15g

All information and tools presented and written within this site are intended for informational purposes only. This information is provided as a courtesy and there is no guarantee that the information is accurate.

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