Roasted Cauliflower and Gruyère Gratin

Roasted Cauliflower and Gruyère Gratin is a cheesy side dish that is made by smothering oven-roasted cauliflower in a gruyère cheese sauce and then baking it in the oven until it is golden and bubbly.

Roasted Cauliflower and Gruyère Gratin is a rich and decadent side dish that is made by smothering oven-roasted cauliflower in a gruyère cheese sauce and then baking it in the oven until it is golden and bubbly.

Every night when we have dinner, I make a veggie side to go with whatever protein we're having.  I usually like to roast veggies, but I'm also big on casserole type sides, too.  The other night I decided to combine the two and make this uber cheesy roasted cauliflower gratin.

What makes this dish so yum is that the cauliflower is roasted in the oven before it's baked with the cheese sauce.  Roasting veggies gives them that gorgeous golden caramelization that makes my mouth water.  I seriously think I could just eat roasted veggies forever.  I simply adore them!

Just look at all of those brown bits down there.

I love cheese just as much as I love roasted veggies, so I topped the roasted cauliflower with a gruyère cheese sauce, made with a onions, garlic, and nutty shredded gruyère.  Fabulous, I tell ya.

I poured that rich cheese sauce right on top of the roasted cauliflower.  Oh, the decadence!  Sinful, right?

Oh so sinful, and oh so good.

To make a gratin, however, you've got to have a cheesy crunch on top, so next came more cheese (oh, yeah) and some panko breadcrumbs.

The panko breadcrumbs add the perfect texture to the top of the casserole.  And the cheese?  Well, you can never have too much cheese.  That's my opinion and I'm sticking to it.  The more cheese, the merrier!

After a quick bake in the oven, the outcome is a decadent, creamy, cheesy, earthy, veggie side dish that it out of this world.  We had it as a side dish accompanying our steak, but it would be just as good with roasted chicken or pork chops!

I'm thinking it might even steal the show on Thanksgiving or Christmas.

Roasted Cauliflower and Gruyère Gratin |

If you've been looking for a way to make your cauliflower the star at your dinner table, then skip the steaming and roast it.  Then smother it in cheese sauce and bake it.  Un-be-LIEV-ably good!

Roasted Cauliflower and Gruyère Gratin

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  • 1 large head cauliflower, cored and cut into florets
  • 1/4 cup olive oil
  • 1/2 tsp salt
  • 1/2 teaspoon dried thyme
  • 1/4 tsp pepper
  • 1/4 cup butter
  • 1/3 cup onion, finely chopped
  • 1 clove garlic, minced
  • 3 Tbsp flour
  • 2 cups hot milk
  • 1/8 tsp ground nutmeg
  • 2 cups gruyère cheese, shredded
  • 1/4 cup panko breadcrumbs

  1. Preheat your oven to 425 degrees.  In a large bowl, toss the cauliflower, olive oil, salt, thyme, and pepper.  Place onto a foil-lined baking sheet in a single layer.  Roast for 10 minutes, stir, then roast for an additional 10 minutes.  Remove from the oven and reduce the heat to 375 degrees.
  2. Meanwhile, melt the butter over medium heat in a saucepan.  Add the onions and cook for 3 minutes.  Add the minced garlic and cook for 1 minute more.  Add the flour to the pan and stir constantly with a whisk for 1-2 minutes, or until the flour begins to turn golden.  Pour the milk into the saucepan, continuing to whisk until the mixture comes to a boil.   Boil for 1 minute, or until thickened.  Remove from the heat and stir in the nutmeg and gruyère cheese, reserving a 1/2 cup for topping.
  3. Spoon a little bit of the sauce into the bottom of a 2 quart glass baking dish.  (I used two small ones.)  Pour the cauliflower into the dish and top with the remaining sauce.  Mix toether the remaining 1/2 cup of cheese and the breadcrumbs.  Spread evenly over the top and drizzle lightly with olive oil.
  4. Bake in the 375 degree oven for 25 minutes, or until golden and bubbly.  Let cool 5 minutes before serving.



  1. Can these be prepped before hand, kept in the refrigerator and then baked a day or two later?

  2. I know this will sound goofy...i know the term sinful tasting food is suppose to sound like it is a good thing, but we never understood that goofy term...sinful tasting sounds bad to many of my friends, and so if it is sinful tasting, how can it be good? No offense, your recipes look good, it's just some of our terms seem unfitting, even tho that term is an old one...keep up the recipes, you are talented!