Want to know how to make the most delicious Christmas sprouts gratin this year? Try these delicious Brussels Sprouts gratin! Roasted Brussels Sprouts are enveloped in a cheesy white sauce, topped with bread crumbs and cooked to perfection in the air fryer. Oven instructions included.
About this Christmas sprouts gratin recipe
Forget the soggy, bitter Brussels sprouts of Christmases past. This year, we’re taking those humble little cabbages to new heights of flavour and decadence with a gratin so good, it’ll have everyone asking for seconds (and thirds!). This gratin isn’t just a side dish; it’s a showstopper.
After making it a few times, I have mastered the perfect sprouts gratin thats perfect to grace the holiday table. The key is to roast the sprouts first until they’re slightly caramelised. The crispy breadcrumb topping is the perfect finishing touch. Serve this decadent dish alongside your holiday roast or whole roasted cauliflower for the perfect Christmas dinner!
This Brussels sprouts gratin is going to change the way you think of Brussels Sprouts. It is sure to convert haters to lovers!
How to make the best Brussels Sprouts gratin in air fryer/ oven? -Step by Step:
This Christmas Sprouts recipe comprises three simple steps.
Roast the Brussels sprouts in the air fryer for 8-10 minutes. The secret to their deliciousness lies in the seasoning – Chilli salt from Cornish sea salt. If unavailable, craft your own blend by combining 1/2 teaspoon of garlic powder, onion powder, oregano, mild paprika, and salt. Alternatively, toss the sprouts in a bit of fajita or taco seasoning.
Toss the Brussels sprouts with oil and chilli salt, then air fry at 180C for approximately 8 minutes.
Prepare the easy white sauce, using my favourite béchamel sauce from my cauliflower cheese recipe. I like to use familiar flavours to entice everyone to reach for more.
Assembling and Cooking: Arrange the sprouts in your deep serving dish. Pour the white sauce over them and top with white breadcrumbs or flavoured breadcrumbs for an extra layer of deliciousness. Air fry or oven-bake until the sauce is bubbly and the crumbs are golden brown.
For Air Fryer Instructions: Place the assembled dish in the air fryer basket and air fry at 180C for about 10-12 minutes or until golden brown.
For Oven Instructions: Preheat the oven to 220C/200C fan/gas 7. Bake the dish in the center of the oven for 20-25 minutes or until golden brown and bubbling. Allow it to rest for at least 10 minutes before serving.
Tips to make the best Brussels sprouts gratin
Roasting the Brussels sprouts unlocks their hidden sweetness and depth of flavour. Try this instead of boiling them.
Don’t just season the sprouts with salt and pepper. Think flavours! I have used Chilli salt. You can sub with fajita or taco seasoning for a delicious mix.
A creamy, cheesy sauce made of cheddar adds to the deliciousness. You can also swap for Gruyère and Parmesan to create a luxurious base.
A simple breadcrumb topping adds texture and richness. For extra deliciousness, opt for flavored breadcrumbs or toss your white breadcrumbs with herbs before using them in the recipe.
Choose the right sprouts to ensure a perfectly bubbly top.
Variations: Add banana shallots, bacon, pancetta, or even chestnuts for a touch of savoury flair.
Brussels sprouts gratin is a delightful and versatile dish that can be enjoyed as a side or even as a main course. Serve it alongside a Christmas vegetable traybake, air fryer crispy potato slices, lentil loaf, curried butternut squash soup, easy garlic knots, or Christmas coleslaw.
Explore my collection of 50+ vegetarian Christmas dinner recipes for even more inspiration, to pair with the festive gratin.
More Brussels sprouts recipes
Homemade Brussels sprouts gratin recipe made in air fryer/ oven
- 500 g Brussels sprouts trimmed and halved if large
- 2 tsp olive oil
- 2 tsp chilli salt **( see notes for substitutions)
- 2 tbsp butter
- 2 tbsp plain flour
- 250 ml double cream
- 200 ml whole milk
- 1 tsp dijon mustard
- salt and pepper to taste
- 75 g mature cheddar grated
On the top
- 50 g dried bread crumbs
- 2 tbsp parsley
- Toss the Brussels sprouts with oil and salt. Air fry at 180C for 8-10 minutes until roasted and tender.500 g Brussels sprouts
- Simultaneously, make a cheese sauce.Heat butter in a pan. When melted, add the flour and cook continuously in low flame to create a roux.2 tbsp butter, 2 tbsp plain flour, 200 ml whole milk, 250 ml double cream, salt and pepper to taste, 75 g mature cheddar
- Then add the milk and cream a little at a time first and continue to whisk until thick.
- Add the dijon mustard, and stir and cook until the sauce bubbles.Switch off the flame and add cheddar cheese.1 tsp dijon mustard
- Transfer the roasted sprouts to an oven dish. Pour the cheese sauce over until fully coated. Top with the breadcrumbs over the top.
- Transfer the dish to the air fryer basket. Air fry at 180C for 10-12 minutes until the sauce is bubbling and the top is brown.
Baking in the Oven
- Preheat the oven to 200C. If you would like to bake, place the the dish in the middle rack of the oven. Bake for 20-25 minutes until sauce is bubbling and the top is brown.
- Garnish with chopped parsley.