Cheesy Cauliflower Broccoli Gratin

Golden, bubbly Cheesy Cauliflower and Broccoli Gratin, perfect vegetarian side dish for dinner. Pin it
Golden, bubbly Cheesy Cauliflower and Broccoli Gratin, perfect vegetarian side dish for dinner. | jasminerecipes.com

This comforting baked gratin combines tender cauliflower and broccoli florets smothered in a smooth, creamy cheese sauce. The dish is finished with a golden, crispy topping made from Parmesan cheese and breadcrumbs, offering a perfect balance of textures. It’s simple to prepare and ideal for serving as a flavorful side or a satisfying vegetarian option. With notes of sharp cheddar, Gruyère, and a touch of mustard and nutmeg, this dish provides rich, layered flavors that enhance the natural sweetness of the vegetables.

Discovering this Cheesy Cauliflower and Broccoli Gratin was like finding a cozy hug on a chilly evening. I remember the first time I made it, the creamy cheese sauce filling my kitchen with mouthwatering warmth that promised comfort in every bite.

One rainy afternoon, when surprise friends knocked on my door, I whipped this up and served it piping hot. The golden crust and tender florets sparked instant smiles — moments like that turn cooking into memories.

Ingredients

  • Cauliflower and Broccoli: Fresh heads cut into florets to get the perfect tender bite without mushiness.
  • Sharp Cheddar and Gruyère: A blend that melts smoothly and brings a deep cheesy flavour.
  • Dijon Mustard and Nutmeg: Tiny additions that lift the sauce beyond ordinary comfort food.
  • Parmesan and Breadcrumbs Topping: Gives that crave-worthy crisp golden finish every gratin deserves.

Instructions

Get Everything Ready:
Preheat your oven to a welcoming 200°C (400°F), gently greasing a 2-liter baking dish to keep the gratin from sticking.
Prepare the Vegetables:
Boil salted water until it sings, then immerse your cauliflower and broccoli florets briefly so they soften just right, still holding their shape.
Make the Cheese Sauce:
Melt butter till it gently bubbles, whisk in flour to form a smooth paste, then gradually add milk, stirring constantly until thick and creamy with the scent of warmth starting to build.
Blend in Flavor:
Off the heat, fold in cheddar and Gruyère cheese along with Dijon mustard and freshly grated nutmeg, stirring until melted into a luscious sauce that promises richness.
Assemble the Gratin:
Arrange your perfectly drained veggies in the dish, pour over the velvety cheese sauce, and sprinkle the Parmesan and breadcrumb mixture on top with a drizzle of olive oil ensuring a golden crust.
Bake to Perfection:
Slide it into the oven for 25 to 30 minutes until you see bubbling cheese beneath a crust that’s kissed by golden color. Let it rest briefly so every bite settles into cheesy comfort.
Tender cauliflower and broccoli baked in a rich cheese sauce for this Cheesy Cauliflower Gratin. Pin it
Tender cauliflower and broccoli baked in a rich cheese sauce for this Cheesy Cauliflower Gratin. | jasminerecipes.com

This dish turned into more than just dinner when it became my go-to comfort food, served after long days and shared during cozy gatherings — it’s a warm memory baked into every bite.

Keeping It Fresh

When making this gratin ahead, I tightly cover the unbaked dish with foil and refrigerate it. On baking day, add a few extra minutes to ensure everything is warmed through and the top crisps beautifully.

Serving Ideas That Clicked

I love pairing this gratin with a simple green salad dressed tangy to balance the creaminess or alongside roast chicken for a hearty meal that impresses everyone without fuss.

A Time This Recipe Saved the Day

Once, after a tiring day and no time to cook, I threw this together with what I had. The bubbling cheese and crunchy topping felt like a little victory and made the evening instantly better.

  • Don’t forget to sprinkle some extra Parmesan before baking for an even cheesier crust
  • If breadcrumbs aren’t handy, crushed gluten-free crackers work beautifully too
  • Leftovers are perfect reheated and even freeze well for later comfort food moments
This Cheesy Cauliflower and Broccoli Gratin features a crispy, golden, cheesy topping ready to serve. Pin it
This Cheesy Cauliflower and Broccoli Gratin features a crispy, golden, cheesy topping ready to serve. | jasminerecipes.com

Thanks for sharing this kitchen moment with me — may this gratin bring warmth and smiles to your table just like it did to mine.

Recipe FAQs

Blanch the cauliflower and broccoli for 3-4 minutes until just tender, then drain thoroughly before adding the cheese sauce to prevent sogginess.

Yes, substitute all-purpose flour with gluten-free flour and use gluten-free breadcrumbs to maintain a crisp, golden topping.

Sharp cheddar and Gruyère provide balanced sharpness and creaminess, but you can also try smoked Gouda or mozzarella for variation.

Bake as directed, then broil for the last 2-3 minutes to achieve a perfectly golden, crunchy crust.

Yes, all ingredients are vegetarian-friendly, and the dish can be easily adapted for gluten-free needs.

Cheesy Cauliflower Broccoli Gratin

A creamy baked dish with tender cauliflower and broccoli in a rich cheese sauce and crispy topping.

Prep 20m
Cook 35m
Total 55m
Servings 6
Difficulty Easy

Ingredients

Vegetables

  • 1 medium head cauliflower, cut into florets (approximately 1.3 lbs)
  • 1 medium head broccoli, cut into florets (approximately 0.9 lbs)

Cheese Sauce

  • 2 tablespoons unsalted butter
  • 2 tablespoons all-purpose flour (gluten-free flour for GF option)
  • 1 ½ cups whole milk
  • 1 cup grated sharp cheddar cheese
  • ½ cup grated Gruyère or Swiss cheese
  • ½ teaspoon Dijon mustard
  • ¼ teaspoon freshly grated nutmeg
  • Salt and freshly ground black pepper, to taste

Topping

  • ½ cup grated Parmesan cheese
  • ½ cup fresh breadcrumbs (use gluten-free for GF option)
  • 1 tablespoon olive oil

Instructions

1
Preheat oven and prepare dish: Preheat oven to 400°F. Lightly grease a 2-quart baking dish.
2
Blanch vegetables: Bring a large pot of salted water to a boil. Add cauliflower and broccoli florets and cook for 3 to 4 minutes until just tender. Drain thoroughly and set aside.
3
Make roux: In a medium saucepan over medium heat, melt butter. Whisk in flour and cook, stirring constantly, for 1 minute.
4
Prepare cheese sauce: Gradually pour in milk while whisking until smooth and slightly thickened, about 3 to 4 minutes. Remove from heat and stir in cheddar, Gruyère, Dijon mustard, nutmeg, salt, and pepper until cheeses are fully melted.
5
Assemble gratin: Place drained cauliflower and broccoli evenly in the prepared baking dish. Pour cheese sauce over the vegetables.
6
Add topping: Combine Parmesan, breadcrumbs, and olive oil in a small bowl. Evenly sprinkle this mixture over the gratin.
7
Bake gratin: Bake for 25 to 30 minutes until the topping is golden and the gratin is bubbling.
8
Rest before serving: Allow the gratin to rest for 5 minutes before serving.
Additional Information

Equipment Needed

  • Large pot
  • Medium saucepan
  • Whisk
  • 2-quart baking dish
  • Mixing bowls
  • Colander

Nutrition (Per Serving)

Calories 265
Protein 13g
Carbs 16g
Fat 16g

Allergy Information

  • Contains milk, wheat (gluten), and cheese (dairy). Use gluten-free flour and breadcrumbs for gluten-free adjustments.
Jasmine Carter

Easy, nourishing recipes and kitchen wisdom for everyday cooks and food lovers.