My Christmas vegetable gratin recipe is exactly what you need on your holiday table. It’s made with Christmas vegetables, all cooked together in one dish—so you can take it straight from the air fryer (or oven) to the table, no fuss! It’s vegetarian, super easy to make, and absolutely delicious.
Take a look at our 50+ Vegetarian Christmas Dinner recipes collection.
Stress-Free Holiday Cooking with a Christmas Veggie Gratin
Let’s be real—Christmas cooking can be pretty stressful. There’s so much to juggle, from the mains to the sides, plus making sure everything gets to the table hot! I’ve been there, stressing over the timing and trying to make sure all those classic Christmas vegetables make an appearance on the plate.
That’s why I love this Christmas vegetable gratin! It’s the ultimate fuss-free dish. I can prep it ahead of time, pop it in the oven (or air fryer!), and serve it straight to the table in one beautiful dish. And it’s not just for Christmas—I’ve served this at Thanksgiving and even with Sunday roasts. It’s a real crowd-pleaser that works for any special occasion.
My Secret to a Quick and Easy Festive Side Dish
Let me tell you, I used to think about buying those partially prepared veggie dishes from stores like Waitrose, M&S, or Tesco. But guess what? You still need to bake them, and they don’t always taste as fresh.
So here’s my little secret: you can make your own creamy vegetable gratin at home with just 15 minutes of hands-on time! This recipe combines the rich flavors of dauphinoise potatoes with festive veggies like Brussels sprouts, carrots, and parsnips. It’s cheesy, comforting, and way better than anything store-bought. Plus, if you want to save time, I highly recommend using the air fryer—it cuts the cooking time in half!
And if you’re a fan of potato gratin, definitely try my air fryer dauphinoise potatoes. They're just as easy and seriously delicious!
Some other easy veggie sides I love to make on Christmas day include crispy potato slices, Christmas tray bake, roast parsnips, garam masala and honey glazed carrots.
Why you'll love this recipe?
- Simple and Quick: Just 15 minutes of prep!
- Air Fry or Oven: Choose your method—air frying is faster! I prefer to use my Instant vortex versazone with 8.5l air fryer basket capacity.
- Budget-Friendly: A flavorful, budget-friendly Christmas vegetable dish made with seasonal ingredients.
- Versatile: Serve as a side or even a main by adding proteins or extra vegetables.
- Easy Adaptation: Customize with your favorite herbs, spices, or cheese.
- Dietary Flexibility: This dish is vegetarian, and with a few tweaks, you can make it a vegan Christmas vegetable gratin.
- Make It Ahead: Prep and refrigerate the dish up to 24 hours before cooking.
Ingredients
For this Christmas vegetable gratin, I like to keep things flexible. You can use whatever seasonal vegetables you have at home, but here’s what I typically go for:
- Christmas Veggies: My go-to mix includes potatoes, carrots, parsnips, and Brussels sprouts. You could easily swap in leeks or any other root vegetables for Christmas gratin. This dish is really versatile, so feel free to make it your own!
- Cream: I use double cream (or heavy cream if you’re in the US) for that rich, creamy texture we all love in a cheesy vegetable gratin for holiday dinner.
- Cheese: Cheddar works great for me—either medium or mature. But if you’re feeling fancy, Gruyère or Parmesan would be delicious too.
- Onion: I usually stick to white or brown onions for this dish. Red onions could change the look, but if you’re okay with a bit of color, go for it!
- Garlic: Freshly minced garlic is key here for that depth of flavor. Garlic powder can work in a pinch, but fresh garlic really makes a difference.
- Milk: Full-fat milk gives the creamiest result, though semi-skimmed works if that's what you have on hand.
- Salt & Pepper: These are essential for balancing flavors. Season to taste!
- Other Ingredients: A pinch of nutmeg and a bay leaf really elevate the festive feel of this dish. They bring a subtle warmth to the flavor.
Slicing the Veggies
To make your vegetable gratin for Christmas, start by prepping the veggies:
- Wash the potatoes, carrots, parsnips, and Brussels sprouts thoroughly.
- Slice the potatoes, carrots, and parsnips into thin rounds—about ⅛-inch thick. A mandoline slicer works best for even slices.
- Trim and slice the Brussels sprouts into thin discs.
- If you have time, soak the potato slices in cold water. This removes excess starch and keeps them fresh.
How to make Christmas Vegetable Gratin in the air fryer?
Step 1-4: Make the Creamy Sauce: Combine the cream, milk, garlic, bay leaf, nutmeg, salt, and pepper in a jug. Microwave it for about 2.5 minutes to infuse the flavors. Don’t forget to remove the bay leaf before pouring! This is very similar to the sauce I make for my cheesy potato gratin.
Step 5-10: Layer the Veggies: Grease a casserole dish and layer your sliced potatoes, onions, carrots, parsnips, and Brussels sprouts. Keep layering until all your veggies are used up. The top layer should be potatoes for that nice finish. Pour the cream mixture over everything and add half the cheese.
Step 11 - 12: Air Fry. Cover the dish with foil and pop it in the air fryer at 180°C (360°F). Cook for 35-45 minutes, or until the veggies are tender. Cheese Finish: Once the veggies are done, remove the foil, sprinkle the rest of the cheese on top, and air fry for another 4-5 minutes until the cheese is melted and golden.
Rest and Garnish: Remove from the air fryer basket. Let the vegetable gratin rest for 10 minutes before serving.
How to make Vegetable Gratin in the Oven?
Preheat the oven to 170°C (340°F).Layer the veggies as above, pour the cream over them, and cover with foil.Bake for 50-60 minutes, then remove the foil, add cheese, and bake at 200°C (390°F) until the top is golden and bubbly.Let it cool slightly before serving.
Tips & Variations
If you want to try something different, swap in beets, sweet potatoes, or turnips.
For more flavor, add a bit of fresh thyme or sage. It’ll give your gratin a lovely herby kick.
If you're craving more cheese, you can skip the Brussels sprouts, but I think they add a nice earthy flavor, so I’d still recommend them!
And if you're short on time, just go for a Brussels sprouts gratin. It’s quick with less prep, easy, and super tasty.
Storing leftovers
In the fridge: Place the leftover Air fryer vegetable gratin in an airtight container and store them in the refrigerator. They can be refrigerated for up to 3-4 days.
In the freezer: To freeze the leftovers, transfer the veggie gratin to a freezer-safe container or zip-top bag. They can be frozen for up to 2-3 months. Thaw them in the refrigerator before reheating.
Make ahead Vegetable Gratin for Christmas / Thanksgiving
Christmas and Thanksgiving are busy occasions, requiring careful planning and preparation for a seamless holiday meal. One way to save time and reduce the last-minute chaos is by assembling your vegetable gratin ahead. Follow these simple steps:
- Assemble the veggies: Layer the sliced potatoes, onions, carrots, parsnips and brussels sprouts with the cream mixture and cheese in a baking dish.
- Cover and Refrigerate: Cover the dish with foil or cling film and store it in the refrigerator for up to one day. This allows the flavours to develop and the potatoes to absorb the creamy goodness.
- Preparing for Serving: About one hour before you’re ready to serve, remove the vegetable gratin from the fridge.
- Air Fry to Perfection: Place the dish in the air fryer and cook until the veggies are hot, bubbly, and golden on top. The air frying method ensures a crispy finish without losing the creamy texture.
- Garnish and Enjoy: Once cooked, garnish the festive gratin with your favourite herbs, such as thyme or parsley, for a festive touch. Serve them alongside your Christmas or Thanksgiving feast, impressing your guests with this delectable and hassle-free dish.
Serving Suggestions
When it comes to serving my Christmas Vegetable Gratin, I love to go all out with a generous helping of gravy, roasted veggies, and a dollop of cranberry sauce. A few other sides that go perfectly with it are parmentier potatoes, air fryer roasted green beans, roasted carrots, roasted mushrooms or macho peas.
For bread, I like to keep it simple with eggless dinner rolls, Irish soda bread or no knead bread. They all make the perfect accompaniment!
Recipe FAQ's
For a root vegetable gratin, just leave out the Brussels sprouts. Although I recommend adding them for earthen flavors.
This recipe takes only 15 minutes of prep anyways. To speed it up further, grab a bag of pre cut veggies from the super market. But I suggest make the cream sauce at home - you can customise it to your liking.
More Vegetarian Christmas mains recipes
Easy Christmas gratin recipe below
Ingredients
- 450 g Potatoes sliced to ⅛ inch thin
- 200 g carrots 2 medium sized, sliced ⅛ inch thin
- 150 g parsnips 2 medium sized, sliced ⅛ inch thin
- 150 g brussels sprouts sliced into thin discs
- 1 medium white onion sliced into ⅛ thickness, loosen the rings
- 1 teaspoon unsalted butter
- 300 ml double cream
- 150 ml milk
- 3 cloves garlic minced
- ½ teaspoon nutmeg
- salt to taste
- ½ teaspoon black pepper
- 3 bay leaves
- 50 g cheddar cheese grated
- 2 teaspoon parsley
Instructions
- In a microwave-safe bowl, combine the double cream, nutmeg, garlic, salt, black pepper, and bay leaves. Microwave the mixture for 2 ½ minutes until heated through. Remove the bay leaves. Add 150 ml of milk to the cream mixture and stir well.300 ml double cream, 150 ml milk, 3 cloves garlic, ½ teaspoon nutmeg, salt, 3 bay leaves, ½ teaspoon black pepper
- Grease a 28cm baking dish with unsalted butter.1 teaspoon unsalted butter
- Begin layering the sliced potatoes, onions, carrots, parsnips, brussels sprouts in the greased baking dish, arranging them in a single layer without overlapping too much. Repeat this process until you have used all the veggies. Make sure the potato is the top most layer450 g Potatoes, 1 medium white onion
- Pour the infused cream mixture over the layered veggies, making sure it seeps into the crevices.1 teaspoon unsalted butter, 300 ml double cream, 150 ml milk, 3 cloves garlic, ½ teaspoon nutmeg, salt, ½ teaspoon black pepper
- Sprinkle ½ the amount of grated cheddar cheese over the top.50 g cheddar cheese
Air fryer Instructions
- Preheat the air fryer to 180°C (360°F).
- Cover the baking dish with aluminum foil and place it in the preheated air fryer basket. Bake for 30-40 minutes. Check the potatoes for tenderness by piercing them with a knife.
- Remove the foil, sprinkle the remaining cheese on top, and continue air frying for another 4-5 minutes, or until the cheese has melted and turned a beautiful golden brown.
- Remove the Cheesy Christmas Gratin from the air fryer basket and let it rest for at least 10 minutes before serving. This will allow the flavours to meld together.
- Garnish with fresh parsley and serve.2 teaspoon parsley
Oven Instructions
- Preheat the oven to 170°C (340°F) fan oven. Cover the baking dish with aluminum foil and place it in the middle rack of the oven. Bake for 50 -60 minutes. Check the potatoes for tenderness by piercing them with a knife.
- Increase the temperature to 200C. Add the remaining cheese and bake for 10-15 minutes. Remove the Cheesy Christmas Gratin from the oven and let it rest for at least 10 minutes before serving. This will allow the flavours to meld together. Garnish with parsley and serve.
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