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5.0 from 24 votes

Keto Cauliflower Gratin

This keto cauliflower gratin, rich, cheesy, and comforting, is the perfect alternative to potato gratin.

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 fresh garlic minced
  • ½ cup gruyere cheese grated; 50 grams
  • 1 teaspoon Diamond Crystal kosher salt see notes below
  • 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 using any salt other than Diamond Crystal Kosher Salt, including Morton kosher salt, use half the amount listed.
  • You can top the gratin with bacon bits or crushed pork rinds before baking. 
  • I season this dish simply with salt and pepper. But you can add more spices if you'd like. Try adding a pinch of cayenne and a pinch of dried thyme.
  • If your baking dish is broiler-safe, you can switch the oven to broil after the gratin is done and broil it for 1 minute to brown the top. Keep a close eye on it so that it doesn't burn.
  • To use frozen cauliflower, defrost it according to the package instructions, taking care not to overcook it, and drain it thoroughly.
  • You can keep the leftovers in an airtight container in the fridge for up to 4 days. Reheat them covered in the microwave at 50% power. I don't recommend freezing the leftovers.

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: 4servings

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.