Skip to Content

Cauliflower Au Gratin Casserole

Sharing is caring!

This easy Cauliflower Au Gratin Casserole with bacon is a lovely low carb casserole that you can serve any day! This cauliflower side dish is great any time of year, but it is especially welcome at the holidays when you are looking for some lighter carb items to serve. 

Cheesy and delicious, the cauliflower gratin tastes wonderful and a lot like potatoes, with a lot fewer carbs. I love making this all year round.

Cauilflower Au Gratin recipe

Why You Will Love This Recipe

Hello Friends! I hope you are having a great week. It has been a productive week at our home as I have been cleaning out my craft closet and pulling out the Christmas decor. 

Today’s recipe is a cheesy cauliflower dish that is wonderful to serve at dinners. The cauliflower is a vegetable that I have only recently embraced. Since I follow weight watchers during the week (on most weeks – ahem), this low carb vegetable tastes a lot like potatoes but saves you calories and carbs.

If you have never made a cauliflower dish, this is a great one to try. The tender cauliflower is blended with a creamy cheese sauce, then topped with bacon. This makes a delicious side dish for your holiday dinner. 

Cauliflower has about 1/5 of the calories that potatoes have and if you substitute it in some dishes, this is the perfect side dish to enjoy and you will be saving calories without even realizing it. 

Cauilflower Au Gratin with Bacon

Cauliflower Gratin Recipe Ingredients 

Cauliflower– This tastes best with fresh cauliflower. Pick a firm cauliflower head with no bruises or dark spots. This recipe can also be made with frozen cauliflower. 

Milk – I used heavy cream, but you can use a mixture of half cream and half milk for this recipe

Butter – 

Cheese – I like to use Cheddar cheese, but you can mix it up with some Fontina, gruyere cheese or Parmesan cheese. 

Bacon – I’m partial to low-sodium bacon as I feel it has enough salt in it. You can also use turkey bacon if you wish.

Cauliflower ingredients

Equipment and Kitchen Tools

  • large bowl
  • medium saucepan
  • baking dish
  • spoon
  • cheese grater

How to  make Cauliflower Au Gratin Casserole

The full recipe is below, but the major steps are:

  1. Cook the cauliflower over medium heat. Add cooked cauliflower and bacon to the casserole dish.
  2. Melt the butter. Then in a small bowl, mix together melted butter, milk, and some of the Cheddar cheese.
  3. Top with a light layer of cheese.
  4. Bake until golden brown and enjoy!


How to Make Cauliflower Au Gratin Casserole

Don’t forget to bookmark this recipe! You will want to make this again. 

Cauliflower au gratin recipe with bacon


timesaving tips to streamline recipes

  • Shred the cheese ahead of time and keep it in your refrigerator. Or you can buy the cheese that is already shredded.
  • You can buy prepared cauliflower florets if y9ou want to save time.
  • You can make the bacon ahead of time or use bacon bits, but I highly recommend you make the bacon yourself. 

Recipe Variations, Notes, and Substitutions

  • You can top the casserole with a few breadcrumbs before baking for a nice comfort food touch.
  • Add a little garlic to change up the flavor a bit. 
  • You could add some toasted walnuts to the top of this casserole for a 

More Delicious Cauliflower Recipes

Lemon Roasted Cauliflower – A delicious Lemon Roasted Cauliflower recipe that is perfect any time of year. Made with herbs and lemon, for a tasty vegetable side dish! 

Baked Cauliflower with Cheese -An easy cheesy side dish idea!

Broccoli Cauliflower – An quick side dish that is healthy too!

For more great recipes ideas

Baked Butternut Squash – Baked in the oven with no added sugar.

Slow Cooker Mashed Potatoes – Use your crockpot and save space on your stove with this easy Potato Recipe.

Oven-Baked Brussels Sprouts – These are so tasty as a side dish and are not like any Brussels Sprouts you remember. 

Cauliflower Au Gratin Recipe

Cauliflower Au Gratin Recipe
Print Pin
5 from 1 vote

Cauliflower Au Gratin

This Cauliflower au gratin recipe with bacon is a lovely low-carb side dish option any time of year!
Prep Time 15 minutes
Cook Time 45 minutes
Servings 8


  • 2 large heads cauliflower stems removed and separated into evenly-sized florets
  • 1 cup 2 sticks unsalted butter
  • 2 cups heavy cream
  • 3 cups sharp cheddar cheese divided
  • 1 ½ cups cooked and crumbled bacon
  • Sliced green onions garnish


  • Preheat the oven to 350 degrees. Prepare a 9x13 casserole dish with nonstick cooking spray.
  • 2 .Fill a large stockpot with water to three-quarters full. Add about 1 teaspoon salt. Bring the water to a boil over high heat.
  • Add the cauliflower florets and cook for 10 minutes or until fork-tender.
  • Drain the cauliflower well and place in the casserole dish.
  • Sprinkle half of the bacon over the cauliflower and tuck into the cauliflower florets.
  • Meanwhile, in a large skillet, melt the butter over medium-low heat.
  • When the butter is melted, add the heavy cream and bring to a boil, stirring often. Allow mixture to simmer for 10 minutes. Stir in 2 ½ cups of the cheese and stir until melted. Allow sauce to simmer, stirring often, for an additional 3 to 4 minutes or until the sauce coats the back of a spoon and begins clinging to the sides of the skillet.
  • Pour the sauce over the cauliflower and bacon. Top with the remaining cheese and bacon.
  • Bake for 45 minutes or until the cheese has melted and the cauliflower begins to brown.

I hope you enjoyed this creamy cauliflower au gratin recipe.

For more easy recipes,conside3r  subscribing to my CELEBRATE THE SEASON newsletter, you can subscribe here. I share a few things that I don’t share here and I email you only once a week. I know how valuable your time is and respect that tremendously!

If you try this recipe or any other recipe on Organized Island, please don’t forget to rate the recipe and let me know where you found it in the comments below, I love hearing from you! To see what I am up to, check out my stories on Instagram and let me know you are following. It would bring me much joy!

Want to streamline your weekly meals? Check out my Beginner’s Guide to Meal Planning book on Amazon.


asy Cauliflower Au Gratin in casserole

Recipe Rating

Roasted Broccoli and Cauliflower - Organized Island

Monday 27th of September 2021

[…] Broccoli Au Gratin Casserole – […]

Mardi Gras King Cake - Organized Island

Tuesday 17th of August 2021

[…] Cauliflower Au Gratin – A lighter side dish for the season.  […]

Lemon Roasted Cauliflower - Organized Island

Friday 30th of July 2021

[…] course, cauliflower with cheese is also […]


Monday 23rd of November 2020

Delicious! We're hosting this year! Well, by "hosting," I mean just the five of us (whoa, five now) and Cassidy's mom and her husband. They live in a small town without even a stoplight and have zero cases of COVID and he's totally high risk so we feel safe with them in our bubble. Still a weird year, though. Needs delicious recipes like this! And Cassidy is low carb.


Tuesday 24th of November 2020

Nice! We are having a dinner with just our immediate family too. Hope you have a wonderful holiday!