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Keto Cauliflower Gratin
5 from 24 votes

Keto Cauliflower Gratin

Keto Cauliflower Gratin is a creamy baked dish featuring tender, microwaved cauliflower tossed in a sour cream and Dijon mustard sauce with fresh garlic and gruyere cheese. The gratin is finished with a sprinkle of Parmesan cheese and baked until hot and slightly golden, offering a rich, cheesy side dish with a smooth texture and mild seasoning.

Prep Time
15 mins
Cook Time
15 mins
Total Time
30 mins
Servings: 4 servings
Calories: 218 kcal
Course: Side Dish
Cuisine: French

Ingredients

  • 1 teaspoon butter for pan
  • 1 pound cauliflower florets
  • 1 cup sour cream
  • 1 teaspoon Dijon mustard
  • 1 tablespoon garlic minced, fresh
  • ½ cup gruyere cheese grated; 50 grams
  • 1 teaspoon kosher salt see notes below, Diamond Crystal brand
  • ½ teaspoon black pepper freshly ground
  • 2 tablespoons Parmesan Cheese grated

Instructions

    Cup of Yum
  1. Preheat the oven to 425°F. Grease a shallow 1.5-quart baking dish with butter or olive oil.
  2. Place the cauliflower florets in a large microwave-safe bowl. Add a tablespoon of water. Cover with a microwave-safe plate and microwave on high until tender-crisp, 5-7 minutes.
  3. Meanwhile, in a large bowl, mix together the sour cream, mustard, garlic, gruyere, salt, and pepper.
  4. Drain the cooked cauliflower well (be careful, the bowl will be hot) and pat it dry. Add it to the sour cream sauce, gently tossing to combine.
  5. Transfer the mixture to the prepared baking dish. Sprinkle the parmesan on top.
  6. Bake the gratin until heated through, for about 10 minutes. Serve immediately.

Notes

  • If not using Diamond Crystal kosher salt, reduce salt amount by half to avoid oversalting.
  • You may add bacon bits or crushed pork rinds before baking for extra texture and flavor.
  • To brown the top, switch oven to broil for 1 minute after baking if your dish is broiler-safe; watch closely to prevent burning.
  • Frozen cauliflower can be used if thawed and drained well to avoid sogginess.
  • Store leftovers in an airtight container in the refrigerator up to 4 days and reheat covered at low microwave power.
  • Freezing leftovers is not recommended as texture may degrade.

Nutrition Information

Serving 0.25recipe Calories 218kcal (11%) Carbohydrates 9g (3%) Protein 9g (18%) Fat 17g (26%) Sodium 447mg (19%) Fiber 3g (12%)

Nutrition Facts

Serving: 4 servings

Amount Per Serving

Calories 218

% Daily Value*

Serving 0.25recipe
Calories 218kcal 11%
Carbohydrates 9g 3%
Protein 9g 18%
Fat 17g 26%
Sodium 447mg 19%
Fiber 3g 12%

* Percent Daily Values are based on a 2,000 calorie diet.