Horseradish Cheddar Cauliflower Gratin


Fluffy and cheesy with a little kick, this light and healthy vegetable side dish can be prepared ahead for a busy weeknight, or would be a delicious veggie for your holiday meal or an elegant dinner. Move over mashed potatoes, I’ve got Horseradish Cheddar Cauliflower Gratin.

Horseradish Cheddar Cauliflower Gratin

Horseradish Cheddar Cauliflower Gratin | | #sidedish #vegetable #glutenfree #vegetarian

I think The Hubby and I were clearly fed way too many mashed potatoes when we were kids, because now we just don’t like them. Occasionally I’ll make some sort of smashed potatoes that are jazzed up with something flavorful and left kinda chunky, and that is fine, but plain, smooth, creamy mashed potatoes never happen in our house.Even on Thanksgiving, he and I will usually pass the bowl in order to save room for more stuffing or sweet potatoes.

So when a pile of white stuff shows up on The Bug’s plate, even he knows it’s cauliflower. And he is cool with that.

I love my kid.

Now, I’m not gonna try to tell you that these taste like mashed potatoes. Nobody buys that lie anymore. But I like cauliflower. My family likes cauliflower. So when I say that we are having cauliflower with dinner, I don’t get any complaints. If you want to try to fool your kids, that’s on you :-)

Horseradish Cheddar Cauliflower Gratin | | #sidedish #vegetable #glutenfree #vegetarian

But that doesn’t mean that this Horseradish Cheddar Cauliflower Gratin isn’t delicious. Nice and fluffy, but because you add Greek yogurt and egg, and then bake it, there is structure to it. It’s not super creamy (though it is smooth), and if you let the cauliflower drain well, it won’t be watery either. Then you get the sharp cheddar cheesiness and the little kick of horseradish, which totally isn’t overwhelming. Evidence – I had an almost four year old and a one year old shoveling this in their mouths.

The first time I made this, we ate it with roast chicken, and it was wonderful, but I think it would be especially awesome with a nice steak on the grill. Or, with Easter and Passover coming up, the creamy little kick of horseradish would be amazing with ham or brisket.

Horseradish Cheddar Cauliflower Gratin | | #sidedish #vegetable #glutenfree #vegetarian

One great thing about this recipe is that you can prepare all of part of it in advance, which makes it idea for busy weeknights OR holiday meals where you have to prepare a lot of dishes. Steam up the cauliflower and let it cool down and dry off (that actually keep it from being too watery), or get the entire casserole prepared and throw it in the fridge, or bake it off completely then reheat it in the over to get the cheese extra toasty (that’s what I did, since I was taking photos at around 3 in the afternoon).

And if you were having a fancy little dinner party, you could put it into individual ramekins, like I did with this Whipped Cauliflower Gratin. Just adjust your baking time a bit.

Horseradish Cheddar Cauliflower Gratin | | #sidedish #vegetable #glutenfree #vegetarianDisclaimer: Samples of Cabot cheese were provided to me at no cost by the Cabot Creamery Cooperative. I was under no obligation to create a recipe or write this post. All opinions are my own.

How do you like your mashed potatoes – whipped and smooth, smashed and chunky, or not at all?

5.0 from 1 reviews
Horseradish Cheddar Cauliflower Gratin
Prep time
Cook time
Total time
Fluffy and cheesy with a little kick, Horseradish Cheddar Cauliflower Gratin is a light, healthy vegetable side dish for a busy weeknight or a holiday meal.
Recipe type: Side dish, vegetable
Serves: 4-6
  • 1 head cauliflower
  • ¼ cup plain Greek yogurt (I used Chobani 0% plain)
  • 1 egg
  • About 4 oz. or about 1 cup shredded Cabot Horseradish Cheddar Cheese, divided
  • 1 t kosher salt
  • freshly ground black pepper
  • paprika, optional
  1. Preheat your oven to 400°F, and lightly coat a 2 quart casserole dish with oil or cooking spray.
  2. Cut the cauliflower into large florets, discarding the tough stem, and steam over boiling water until very tender.
  3. Drain thoroughly, and allow to cool slightly so that some of the excess moisture evaporates.
  4. Place the cauliflower, Greek yogurt, egg, ¾ c of the cheese, salt, and pepper into a blender or food processor, and process until smooth.
  5. Transfer the cauliflower to the prepared dish and sprinkle with remaining cheese, and paprika, if desired.
  6. Bake for 25-30 minutes, or until heated through and browned on top.
You can also divide the cauliflower mixture between 4-6 ramekins and bake for 15-20 minutes.

The casserole can be prepared ahead of time and baked or reheated before serving.


Horseradish Cheddar Cauliflower Gratin | | #sidedish #vegetable #glutenfree #vegetarian

Want some more Gratins?

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And here are some from my friends…


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  1. says

    I am cooking dinner for friends tomorrow night and was looking for side ideas, Brianne, so this has come at the perfect time. I have both cauliflower and broccoli so I’m going to mix them for this beautiful dish. Thank you!
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  2. says

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  3. Sally says

    Id luv to try this…only prob is that although we are lucky enough to live in land of cheese (and cuckoo clocks) alas we cannot buy anything more than a fairly mild non descript cheddar here…
    Any ideas on how I could replicate your flavours without your horse radish cheddar?
    am hoping to make this tomorrow for dinner so would be very grateful if have time x quick tip…otherwise it’ll be my much loved bit pretty uninspiring cauliflower and cheese

  4. says

    This tastes great! I used Cabot Cheddar and added some miscellaneous hot mustard sauce. I also bought a purple caluiflower head. I hope the kids will enjoy it as much as I just did! 😀

  5. Melody says

    I dont think i have ever seen horseradish cheddar at our local supermarket. If i cant find it how much horseradish would i mix with cheddar cheese to get the same taste?

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