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This cauliflower au gratin is super rich and ultra cheesy. It’ll become a family favorite in no time! Perfect for the holidays, the cauliflower is roasted for a delicious side dish that’s all creamy and not watery!

Overhead shot of cauliflower au gratin in a baking dish

What Makes This Recipe So Good

  • This cauliflower au gratin is made of cauliflower smothered in tons of cheesy goodness and topped with rich, buttery breadcrumbs. It’s the perfect side dish for holidays or if you just want a new way to get your kids to eat veggies!
  • With an easy first step to help remove moisture, the cauliflower in this recipe isn’t soggy or mushy, making the texture of this au gratin absolutely perfect.
  • A couple easy swaps make this recipe gluten free, so it’s great if you’re serving it to guests or family members who are sensitive to gluten.

Chef’s Tips

  • To make this cauliflower au gratin gluten free, swap the breadcrumbs for gluten free ones and the flour for gluten free all-purpose flour.
  • You can use any type of shredded cheese for this recipe, but I absolutely love shredded cheddar. Gruyere is also a good option, as is swiss or white cheddar.
  • Use fresh cauliflower instead of frozen. Frozen will make your cauliflower au gratin way too watery.
A spoonful of cauliflower au gratin being lifted from a baking dish

More Holiday Side Dishes

Recipe By: Cheryl Malik
5 from 1 vote

Cauliflower au Gratin

Prep 55 minutes
Cook 10 minutes
Total 1 hour 5 minutes
This cauliflower au gratin is super rich and ultra cheesy. It'll become a family favorite in no time! Perfect for the holidays, the cauliflower is roasted for a delicious side dish that's all creamy and not watery!
8 servings


  • 8 cups cauliflower florets about 2 medium heads or 1 large, about 2 pounds in total
  • salt to taste
  • 1 small onion chopped
  • 6 tablespoons unsalted butter ½ stick, divided
  • 4 tablespoons all-purpose flour
  • 2 cups hot milk
  • 1 teaspoon salt
  • ½ teaspoon black pepper freshly ground
  • 2 cups shredded cheese like Gruyere or cheddar
  • ¼ cup parmesan freshly grated
  • ¼ cup breadcrumbs


  • Preheat oven to 375º F and grease a 9×9-inch or 2 quart baking dish. Place cauliflower on baking sheet and roast for 20 minutes. Heat 4 tablespoons butter in a small saucepan over low heat. Add onion and stir until softened, about 5 minutes.
  • Add flour to saucepan and cook while stirring constantly until mixture just starts to brown, about 3 to 5 minutes. Gradually pour milk into mixture, whisking into a smooth sauce. Stir in salt and lots of pepper. Cook until just simmering. Remove sauce from heat and stir in half the shredded Gruyere or cheddar cheese until it melts.
  • Place roasted cauliflower in the prepared baking dish and pour cheese sauce over.
  • Sprinkle cauliflower and cheese sauce with remaining Gruyere or cheddar cheese and 1/4 cup parmesan, if desired. Melt remaining 2 tablespoons butter and stir together with breadcrumbs and a pinch of salt.
  • Bake in the preheated oven until cheese is melted and browned, about 20 minutes. Remove from oven and sprinkle with breadcrumbs. Return to oven for 5-10 minutes or until bubbly. Sprinkle parmesan over with cheese after cooking and serve.
  • Shredded Cheese: We prefer cheddar, but Gruyere, swiss, and white cheddar are also good options.
  • Cauliflower: Use fresh cauliflower instead of frozen. Frozen will make your cauliflower au gratin way too watery.
  • Make it Gluten Free: Use gluten free breadcrumbs and gluten free all-purpose flour.

Approximate Information for One Serving

Serving Size: 1servingCalories: 267calProtein: 12gFat: 18gSaturated Fat: 11gCholesterol: 53mgSodium: 599mgPotassium: 427mgTotal Carbs: 15gFiber: 3gSugar: 6gNet Carbs: 12gVitamin A: 575IUVitamin C: 49mgCalcium: 281mgIron: 1mg
Nutrition Disclaimers
Number of total servings shown is approximate. Actual number of servings will depend on your preferred portion sizes.
Nutritional values shown are general guidelines and reflect information for 1 serving using the ingredients listed, not including any optional ingredients. Actual macros may vary slightly depending on specific brands and types of ingredients used.
To determine the weight of one serving, prepare the recipe as instructed. Weigh the finished recipe, then divide the weight of the finished recipe (not including the weight of the container the food is in) by the desired number of servings. Result will be the weight of one serving.

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  1. Is the cauliflower supposed to be steamed or roasted? Two different things…..

    1. Megan | 40 Aprons Team Megan | 40 Aprons Team says:

      Just a typo – thanks so much for bringing it to our attention! The cauliflower is roasted in the first step.

  2. I could’ve eaten this with just a salad. It was that good. I had it with store-bought roast chicken. Delicious. The only change I made was adding the cheese topping and bread crumbs right when I put it in the oven. Baked for 20-25 min then broiled for a minute. I used Gruyère.5 stars

    1. Avatar Jessica | 40 Aprons Team says:

      So glad you enjoyed it! Thanks for sharing, Jet! 😊

  3. Excellent, my daughter needs to be gluten-free so I substituted the flour for white rice flour. I also used gluten-free bread crumbs and added diced bacon.

  4. Avatar Karen Armijo says:

    Can you sub almond or other milks for regular milk in this recipe?

    1. Hi Karen! Yes, you can sub almond or other milks! I’d recommend you use an unsweetened milk alternative, like soy or oat milk, so there’s less of a flavor difference.

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