Cheesy Cauliflower Casserole | Low-Carb Cauliflower Mac and Cheese

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Loaded to the brim with gooey, cheesy goodness, this cheesy cauliflower casserole is the perfect low-carb and keto friendly macaroni and cheese substitute.
Servings: 6 servings
Time: 25 minutes
Cheesy Cauliflower Casserole--a low carb twist on the classic mac n cheese

You’re going to love this low carb alternative to macaroni and cheese! This cheesy cauliflower casserole is so full of cheesy goodness and SO satisfyingly easy to make that you won’t miss the original.

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Low carb alternative to Macaroni and cheese--Cheesy Cauliflower Casserole!

If you’ve been reading for a bit, you know my husband and I recently embarked on a new diet and lifestyle change. So far with the Ketogenic diet we have lost over 60 pounds combined since April. Pretty amazing right?

Well with any diet, there are certain cravings that can be enough to break some people. I would probably be one of those people if I didn’t see first hand the results from this way of eating.

So what’s on my list of things I miss? First off, bread. Like fresh, hot out of the oven with a crunchy crust, slathered in butter, bread. Excuse me while I wipe the drool from my chin.

Low carb mac and cheese

Read Also: Keto and Low Carb Aldi Shopping Guide

Something else I miss? Macaroni and cheese. I love mac and cheese, especially the homemade, topped with breadcrumbs, loaded with cheese kind. But let’s be honest, right now I’d settle for the cheap blue box with powdered “cheese” kind and I would happily devour the entire box without remorse. Ok, maybe just a tiny bit of remorse.

But how do you make a low carb version of mac and cheese? With my favorite versatile veggie cauliflower of course!  Who needs the blue box when you have this low carb cheesy cauliflower casserole instead?

Even if you aren’t following a low-carb or keto diet, you can still enjoy this cheesy cauliflower casserole. It’s a great way to jazz up the everyday boring side dish and with only a few ingredients, it couldn’t get any easier make. Go ahead and top it with crunchy bread crumbs or even crackers to give it a little crunch. I’ll look the other way.

cheesy cauliflower casserole

Tips for making Cheesy Cauliflower Casserole, AKA Low Carb Cauliflower Mac and Cheese

Make sure you drain off as much water as you can from the cauliflower after boiling. One reader even suggests roasting the cauliflower instead of boiling for extra flavor and to prevent the sauce from becoming runny from excess water. GREAT IDEA!

You can omit the mustard if you don’t like the flavor. I prefer to use a dijon or spicy mustard for extra flavor and kick, but regular yellow mustard works fine too. You could also use powdered mustard in a pinch.

Make sure to continuously stir the heavy cream when bringing it to a boil to prevent scalding and souring. It’s easy to scald heavy cream!

After the cheesy cauliflower casserole has cooked all the way, turn on the broiler for an extra bubbly topping. A few readers have suggested adding a topping of crushed pork rinds for an added crunch! Perfect!

Let the low carb cauliflower mac and cheese stand for about 5-10 minutes after baking to let the sauce get really thick.

More low carb recipes you’ll enjoy:

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Low carb alternative to Macaroni and cheese--Cheesy Cauliflower Casserole!

Cheesy Cauliflower Casserole | Low-Carb, Keto

Loaded to the brim with gooey, cheesy goodness, this cheesy cauliflower casserole is the perfect low-carb and keto friendly macaroni and cheese substitute.
Print Recipe
Cheesy Cauliflower Casserole--a low carb twist on the classic mac n cheese
Prep Time:10 minutes
Cook Time:15 minutes
Total Time:25 minutes


  • 1 whole head of cauliflower , cut into florets
  • 1/2 tsp salt
  • 1 cup heavy cream
  • 2 oz cream cheese
  • 2 tsp dijon mustard
  • 2 cups shredded cheddar cheese , divided
  • salt and pepper to taste
  • 1 tsp garlic powder


  • Preheat oven to 375 and grease a 9×9 glass baking dish
  • Bring large pot of water to a boil. Add cauliflower and 1/2 tsp salt and cook until cauliflower is just fork tender. Do not over cook.
  • Drain cauliflower well and place back in pot. Set aside.
  • In a small sauce pan, bring cream to a simmer, stirring well to avoid scorching.
  • Whisk in cream cheese and mustard and stir until mixture thickens.
  • Remove from heat and whisk in 1 cup shredded cheese and seasonings.
  • Pour over cauliflower and gently mix to combine.
  • Place cauliflower in prepared dish. Sprinkle with remaining cheese and bake until cheese is bubbly and slightly browned, or about 15 minutes.
  • For an extra bubbly topping, broil on high for 2-3 minutes but be sure to watch carefully


Serving: 6servings | Calories: 344kcal | Carbohydrates: 7g | Protein: 12g | Fat: 31g | Saturated Fat: 18g | Polyunsaturated Fat: 10g | Trans Fat: 1g | Cholesterol: 92mg | Sodium: 589mg | Fiber: 2g | Sugar: 4g
Servings: 6 servings
Calories: 344kcal
Author: Amanda


  1. Your cheesy cauliflower casserole is a game-changer! The low-carb twist on mac and cheese is brilliant, and I can’t wait to try it. Congrats on the incredible progress with the Ketogenic diet—60 pounds combined is truly amazing! Thanks for sharing this delicious and satisfying recipe. Excuse me while I join you in drooling over that fresh, hot bread

  2. Super good I made mines with cauliflower and broccoli. N didn’t put garlic powder… my baby loved it and so did my 4 years thanks…

    1. Yum! I doubled it and added broccoli, it was a big hit for family dinner! I also added crushed salt and pepper chips before the final layer of cheese on top for crunch and flavor, turned out delicious! I will definitely make this again!

  3. I know this will sound crazy to a lot of you, but I want to make this dish a little milder on the cheese. I like cheese, but maybe the cheddar was too sharp. Can I mix it up to make it milder? what cheese would you suggest?

    1. Hi Debbie! Not crazy at all. You absolutely could switch out the cheese for something more mild. Perhaps a colby blend or harvarti?

  4. I love this recipe. I have made it many times now. I actually brought it to a work pot luck where many of us are doing KETO and low carb. It was a hit. Not a bite left in my dish. Several people asked for the recipe. I make this just about every week. It satisfy my comfort food need for something rich and cheesy.

  5. This is simply FANTASTIC! perfect macros for me and beyond delicious. Great side for a meal or perfect on its on with a green salad. I’ve made a ton of actual Mac & cheese in my many years. I’ve also tried a few Keto versions and this one is by far the best. This is a staple for me!


  6. I made this recipe with some modifications, more of a vegetable casserole. I used frozen cauliflower and added brocolli florets, red and green peppers and since onions, because my hubby, a huge meat eater, decided he wanted some. I steamed the vegetables instead of roasting them. I subbed some of the cheddar for jalapeno cheese to give it a kick and chopped a vegetarian sausage and added it also. ( My hubby loved it and i have already gotten a request for seconds.

  7. Holy. COW! This was amazing! Added bacon and red pepper flakes on second batch and was truly heavenly! My new keto cauli go-to recipe!

  8. I made this and it was good, but didn’t remind me anything of mac and cheese. More like cauliflower and cheese.

  9. I made this and added taco meat to it and crushed up pork rinds for a crunchy topping. It was delicious! Definitely took away my craving for the blue box stuff.

  10. In the UK we simply call this ‘Cauliflower cheese’ definitely no ‘mac’ involved so the title is a bit misleading.
    Still delicious though.

    1. Hi Jane! Glad you like the recipe. The recipe is titled Cheesy Cauliflower Casserole, however in the U.S. some call it cauliflower “mac” because it’s a low carb replacement to mac and cheese 🙂

    1. HI Cassandra! I’m so sorry you had an issue with the recipe. It could be that the heavy cream curdled when simmering. Sometimes if the heat gets too high, or you do not stir often, that can happen. I hope you give the recipe another try as it really is one of mine and husbands favs!

    1. Hi Cynthia, I haven’t tried freezing this recipe so I can’t say for sure. I would be hesitant with as much dairy this recipe has in it.

      1. About how many ounces or grams of cauliflower would you say this is? I have a few 12 oz bags of fresh cauliflower florets to use up and this looks perfect!

        1. I’m not entirely sure as I haven’t weighed it when I’m cooking. It’s enough to properly fill up a 9×9 baking pan if that helps at all.

  11. This recipe is SO FLIPPING TASTY!!!! I made it for Sunday night dinner with keto salmon patties and my boyfriend and I were in heaven! We will DEFINITELY be making this again :P””’

  12. I made this for Christmas thinking only my husband and I would enjoy this “Keto” side. The entire family was asking why I didn’t make more, and ate it all up! My oldest sister who is basically a chef even said it tasted like her creamed cauliflower, which has always been my favorite!! This is now my very favorite side of all times! I used Tillamook Extra Sharp Cheddar Cheese for that extra flavor!

  13. I’m home alone all day/ all week for lunch – so I made this and added cooked chicken! Great lunch for the whole week – because my family won’t eat cauliflower 🙂

  14. How many calories is in this? I’m using My Fitness Pal to track my food and it requires calories to create a food. Thanks!

        1. Hi Tori. If you are asking the size of a serving, the recipe calls for a 9×9 pan and the nutrition facts are based on 6 servings. So the 9×9 pan is divided into 6 equal parts. I couldn’t tell you exactly the cup or oz of that, but hopefully that answers your question.

  15. I tried my own version of cauliflower Mac and cheese last night for dinner. Sooooo delicious! My hubby said it felt like he was cheating on his diet. I call that a success!

  16. Just made this for dinner. As I tossed the cauliflower in the cheese sauce it was nice and thick but when I pulled it out of the oven the cheese had thinned out quite a bit. Is there anything that I did to cause this? Could the cauliflower cooked more and released excess moisture?
    It’s really good. I’d just love it to be thick out of the oven.

      1. I had the exact same issue (the sauce thinning out in the oven). It also took an extra 10-15 minutes in the oven to get brown and bubbly. I steamed the cauliflower and patted it dry but will try roasting it next time when I have more time to spend. Regardless, it was SO delicious! 🙂 Thanks for the recipe!

        1. Hmm. Well I just checked it with a fork and when it seemed tender enough I took The tray out of the oven. I wanna say it was about 15 to 20 minutes at 400F, but I didn’t write it down, so keep an eye on it!

  17. We have a family picnic tomorrow in a town about 2 1/2 hours away. Do you think it can be prepared and then baked several hours later?

  18. Just had this for dinner. Unbelievably good. My husband and I are in our mid 50’s and decided to change our eating lifestyle for obvious reasons. We are in a low carb diet with daily exercise and it is working wonders. After throwing out all processed canned foods, pasta’s, bread and flour, we feel rejuvenated and elated to be in this journey. Thank you for such a delicious recipe!

        1. I think the cream cheese bumps up the creaminess of it. You could try cutting back on the fat content by using half and half instead of heavy cream. Since we are keto, the high fat is what we need!

          1. It’s based on 6 servings. The exact amount will vary depending on how big the head of cauliflower is, and floret size. Once baked, simply divide your casserole dish into 6 parts. It will probably be somewhere around 1 cup if measured out.

        1. Thank you! While I wouldn’t turn down a big bowl of mac n cheese, I can’t say that I am having anymore withdrawls with this recipe 😉

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