Nothing says low carb comfort food like this Cheesy Cauliflower Casserole.

Cauliflower is topped with a homemade cheese sauce then baked until golden and delicious! Serve it as a side with your favorite mains like Pork Tenderloin with Creamy Dijon Sauce or enjoy it as an appetizer on its own!
baked Low Carb Cheesy Cauliflower Casserole

Cheesy Cauliflower Casserole

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Ways To Serve Cauliflower

Now that cauliflower has become the vegan, vegetarian, paleo and KETO sweetheart of the century, there are dozens and dozens of new ways to prepare this veggie powerhouse. This roasted version is the simplest out there and can be used in so many different ways!

Slice into ‘steaks’ and grill or roast. Or season the entire head, roast, and crumble of bite-sized pieces for a salad or soup topping! Any way you ‘slice’ it, roasting cauliflower is the easy, tasty way to go!

How to Make Cauliflower Casserole

  1. Prep cauliflower and boil until just tender (see recipe below).
  2. Top with cheese sauce.
  3. Bake until golden and delicious!

Try serving this cauliflower cheese casserole over baked chicken breasts for a fancy presentation.

pouring cheese sauce on Low Carb Creamy Cauliflower Casserole

How to Make Easy Cheese Sauce

The sauce for this cauliflower gratin recipe is so easy to whip up, it’ll be on the menu for ALL the vegetables! And the prep is super easy too.

  • Melt all sauce ingredients together.
  • Keep stirring over low heat until everything’s incorporated.

Try this cheese sauce over zucchini, broccoli, brussel sprouts, or any other keto veggies you happen to have on hand. You’ll definitely find a new family favorite with added veggies and no complaints!

Low Carb Cheesy Cauliflower Casserole prepped with sprinkled cheese, ready for the oven

Recipe Tips!

A creamy cauliflower casserole must start with a perfectly creamy cheese sauce! Here are a few tips to get that smooth cheesy texture.

  • The best way to avoid a grainy cheese sauce is to use full-fat cheese and cream.
  • Mix a little cornstarch with the grated cheese to help it stay smooth and elastic while it melts.
  • If the sauce gets grainy, simply lower the heat, add a little more cream and continue to mix until the grainy texture melts away!

This cauliflower gratin recipe lends itself to a variety of flavors so don’t be afraid to experiment! Try adding hot sauce, dijon mustard, or even mix-ins like chopped sundried tomatoes, black olives or herbs like tarragon or basil.

It’s impossible to run out of great ideas for this versatile recipe! Winning!

Must-Try Cauliflower Recipes

baked Low Carb Cheesy Cauliflower Casserole
5 from 14 votes↑ Click stars to rate now!
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Low Carb Cheesy Cauliflower Casserole

Nothing says low carb comfort food like this creamy cauliflower casserole with cheese sauce.
Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Servings 6 servings
Author Holly


  • 1 head cauliflower
  • 1 cup heavy cream
  • ¼ cup cream cheese
  • 1 tablespoon butter
  • ½ teaspoon dry mustard powder
  • ½ teaspoon onion powder
  • pinch cayenne pepper
  • ¼ cup parmesan cheese
  • 1 ½ cups sharp cheddar cheese divided


  • Preheat oven to 375°F.
  • Cut cauliflower into bite sized pieces. Boil 4-5 minutes or until tender crisp. Place in a strainer and drain very well.
  • Add heavy cream, cream cheese and butter to a saucepan and stir over medium heat until smooth and cream cheese is melted.
  • Add seasonings, bring to a boil and let boil 2 minutes while whisking.
  • Remove from heat, stir in parmesan and 1 ¼ cups cheddar cheese.
  • Place in a 9x9 baking pan and top with remaining cheddar cheese. Bake 20-25 minutes or until golden.
5 from 14 votes↑ Click stars to rate now!
Or to leave a comment, click here!

Nutrition Information

Calories: 321kcal | Carbohydrates: 3g | Protein: 10g | Fat: 30g | Saturated Fat: 18g | Cholesterol: 102mg | Sodium: 309mg | Potassium: 123mg | Fiber: 0g | Sugar: 0g | Vitamin A: 1085IU | Vitamin C: 8.8mg | Calcium: 292mg | Iron: 0.3mg

Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.

Course Main Course
Cuisine American

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About the author

At Easy Low Carb® we believe that every meal should be full of big bold flavor! From amazing main dishes and simple sides to the best party snacks, reducing carbs doesn’t mean giving up your favorites!
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    1. Hi Roberta, this cheese sauce should last 3-4 days in the fridge. Just be sure to store in an airtight container and reheat only the portion you intend to use. Enjoy!

    1. Thank you for sharing Scott! We always recommend calculating it with the ingredients/brands you used, as nutrition can change based on that information!

  1. 5 stars
    I do not like mustard even mustard Powder. Will it make a big difference if I omit this do I need to add anything else in place?

    1. Omitting the mustard powder won’t make a huge difference but if you would like to substitute it Tumeric will give you the same flavor profile without the mustard taste!