This post contains affiliate links. Please read my disclosures.
This Cheesy & Creamy Brussels Sprouts Gratin is easy to make without the need for a béchamel sauce. Shredded brussels are gently cooked in butter with finely cut leeks then smothered with a rich and creamy cheese sauce. Grilled until golden and bubbling.
Jump to:
Once I made the smart decision to combine two of our traditional Christmas side dishes into one there was no looking back and I am flabbergasted that I have never done it before.
A Cheesy Brussels Sprouts Gratin is a staple for our festive table but the addition of shredded leeks which was usually our Spring take on the dish is such a revelation.
I’m sure you have a few brussels sprouts hold outs in the family but combined with buttered leeks in this rich creamy cheese sauce this dish will definitely encourage a few converts.
Why You'll Love This Brussels Sprouts Gratin
- Brussels sprouts and leeks are a vegetable marriage to last the ages.
- It’s a brussels sprout dish to convert the most adamant haters.
- It only take 25 minutes and is completely foolproof. No lumpy sauces here.
- You don’t need to make a béchamel sauce. Using cornflour is an easy way to make a cheese sauce which also makes it gluten-free.
- The perfect side dish which is delicious enough to be the main event for the vegetarians at the table.
- The cheese sauce is easy to make, rich with both mature cheddar cheese and cream cheese.
- Full of flavour thanks to smart seasoning.
- Honey dijon mustard. It adds incredible depth to the sauce.
- That final grilling means crunchy golden breadcrumbs and bubbling cheese – a tempting sight to add to the table.
- Easy to make-ahead or freeze.
Ingredients Needed
- Brussels Sprouts - wash, trim the stalk and peel off any grubby layers before shredding.
- Leeks - wash, trim the ends and slice into thin coins to prepare.
- Butter - use unsalted so you can control the salt content.
- Whole Milk - using whole milk means the sauce is very creamy.
- Cornflour - makes the sauce lovely thick and smooth.
- Mature Cheddar Cheese - I love a sharp mature cheddar but you can sub for any melting cheese you fancy. Red leicester or gruyere are also lovely choices.
- Cream Cheese – I always use Philadelphia. It adds lovely richness to the sauce
- Honey Dijon Mustard – the sweetness of this mustard makes all the difference.
- Seasoning - onion granules, garlic powder, salt and pepper add lovely depth.
- Breadcrumbs - I use gluten-free breadcrumbs but you can use any.
How To Make Brussels Sprouts Gratin
- Cook the shredded Brussels and leeks in butter on a gentle heat for 15 minutes. Remove from the heat whilst you prepare the sauce.
- Whisk the cornflour with the milk in a saucepan, then turn on the heat and whisk until bubbling and thick.
- Add the cheddar, cream cheese, mustard and seasoning and stir until the sauce is thick and smooth.
- Pour the sauce over the vegetables and mix until thoroughly combined.
- Transfer the cheesy sprouts and leeks to an oven-to-table dish and sprinkle over the breadcrumbs and extra cheese.
- Grill until golden and bubbling.
Expert Tips
- Peel off the outer layer of the Brussels and trim off the stalks to prepare.
- Shred the brussels and leeks as thin as you can for beautiful ribbony vegetables.
- You want the Brussels and leeks to be wilted in the butter but just turning golden at the edges.
- Swap out mature cheddar cheese for red leicester for a beautiful festive colour.
- If you can’t get hold of honey dijon mustard then regular dijon will do.
Recommended Equipment
- Microplane Course Cheese Grater - It grates quickly and is so easy to wield.
- Flexi Whisk - In a similar vein I have a lot of different whisks but my favourite for sauces is a flexi whisk which gets into all the nooks and crannies of the saucepan meaning you get no unnecessary lumps.
- Oven-to-Table Pan - I wouldn't necessarily but for our weekly Sunday lunches you can bet I make and serve my gratins in my favourite cast iron pan. It's large enough that the pan can accommodate one-pan meals and small enough that it can fit into most ovens. Plus it looks pretty good on the table as part of a homestyle meal.
FAQs
This dish is so easy to prepare in advance. I usually get it to the stage before the final grill. Keep in an airtight container in the fridge for up to 3 days. Transfer the gratin to an oven-to-table dish and sprinkle over the breadcrumbs and extra cheese. However, at this point heat the dish in the oven instead of the grill to ensure the dish is piping hot. Cook at 180°C for 20 minutes until golden and bubbling.
You can freeze any leftovers no problem. However, you can also make the dish ahead of time as above. But instead of storing in the fridge you can freeze for up to 2 months. Defrost completely before cooking in the oven.
Recipe Variations
- Add cooked and chopped streaky bacon into the gratin before the final grill.
- Sub in some blue cheese into the sauce for a lovely complex dish.
- Include shredded kale into the proceedings.
More Vegetable Side Dishes You'll Love
Gluten-Free Cauliflower Cheese. Tender cauliflower florets are smothered in a rich, cheesy sauce made with cornflour. Perfect as a side dish but also a great main for vegetarians.
Carrot and Swede Mash. A simple traditional British side dish that’s both hearty and nutritious. Sweet carrots and earthy swede are boiled until tender, then mashed with butter (or a dairy-free alternative) with lots of seasoning.
Braised Red Cabbage. This festive favourite is slow-cooked to perfection with apples and warming spices. A colourful and flavourful side dish, ideal for Christmas dinners or autumnal meals.
✨Have you tried this Brussels Sprouts Gratin? If you liked it, please leave a 5-star ⭐️ ⭐️ ⭐️ ⭐️ ⭐️ rating on the recipe card and consider leaving a comment as well! I would love to hear about how your recipe turned out and your feedback also helps other readers✨
Cheesy & Creamy Brussels Sprouts Gratin
Ingredients
- 2 tablespoons unsalted butter
- 750 g brussels sprouts - bottom stem removed then shredded
- 2 leeks - washed, topped and tailed and sliced into thin rounds
- ¼ teaspoon salt
- 500 ml whole milk
- 4 tablespoons cornflour - (cornstarch)
- 150 g mature cheddar cheese + 50g extra to sprinkle
- 150 g cream cheese
- 2 teaspoons honey dijon mustard
- 1 teaspoon onion granules
- 1 teaspoon garlic powder
- ¼ teaspoon salt
- ¼ teaspoon ground black pepper
- 2 tablespoons breadcrumbs - you can use gluten-free breadcrumbs
Instructions
- Melt the butter in a large wide bottomed saucepan then add the shredded brussels sprouts and leeks with the salt.
- Cook the brussels sprouts and leeks for 10-15 minutes on a gentle-medium heat stirring occasionally. The leaves should be wilted and just starting to turn golden at the edges.
- Remove from heat and set aside whilst you prepare the cheese sauce.
- Whisk together the milk and cornflour in a large saucepan until smooth. Then turn on the heat and bring up to a gentle boil, whisking all the time. As soon as the sauce begins to boil then the mixture will begin to thicken.
- Add the cheddar cheese, cream cheese, Dijon mustard, onion granules, garlic powder and salt and stir in until the sauce is thick and smooth. Once the sauce just beings to bubble then remove from the heat.
- Pour the sauce over the brussels sprouts and leeks and mix together until fully combined. Transfer to an oven-to-table dish and sprinkle over the breadcrumbs and extra cheddar cheese.
- Place the dish under a grill on medium-heat for 5-10 minutes until the breadcrumbs are golden and the cheese is bubbling.
- Serve straightaway.
Video
Notes
- Serves 6-8 people as a side dish
- Peel off the outer layer of the Brussels and trim off the stalks to prepare.
- Shred the brussels and leeks as thin as you can for beautiful ribbony vegetables.
You want the Brussels and leeks to be wilted in the butter but just turning golden at the edges. - Swap out mature cheddar cheese for any melting cheese you like. Festive coloured Red Leicester or nutty gruyere are lovely choices.
- If you can’t get hold of honey dijon mustard then regular dijon will do.
- Before the final grill transfer into an ovenware dish you would be proud to serve at your table.
- Make ahead – prepare the dish up the final grilling stage. Keep in an airtight container in the fridge for up to 3 days then transfer to an oven-to-table dish, sprinkle on the breadcrumbs and cheese. But do cook in the oven for 20 minutes at 180°C to ensure the dish is piping hot.
- Freeze – You can freeze the finished dish or the gratin up to the final grilling stage. Defrost completely then re-heat according to the advice above.
Kate says
Hey Georgina - I didn't, thankfully. Loved this!!
Kate says
You mention cornflour. On this side of the pond we have cornmeal. Are they the same?
Georgina Hartley says
Hi Kate, great question! Cornflour is the same as cornstarch (we call cornmeal the same). I'll specify on the recipe. Thank you!
Kate says
Our cornstarch is a white, very fine, powder, used as a thickener. The cornmeal is grainier. The photo looks like cornmeal so I'll use that. Thanks!!
Georgina Hartley says
Hi Kate, please don't use cornmeal. The ingredient is definitely cornstarch - which we also use as a thickener. The cornflour/starch is used to thicken the milk for the cheese sauce.