It’s an elegant fall appetizer that looks impressive on the table but uses simple ingredients and straightforward techniques. Serve it for Thanksgiving, Christmas entertaining, a cosy autumn lunch, or a weekend gathering when you want something a little special without spending hours in the kitchen.
Let the onions turn deeply golden before assembling the tart, slice the sweet potato thinly so it cooks evenly, and add the honey walnuts towards the end for that irresistible sweet-and-crunchy finish.
Puff pastry does most of the hard work, giving you a beautiful golden base with minimal fuss. Meanwhile, Brie melts into the vegetables, cranberries provide a bright fruity contrast, and fresh thyme brings everything together with a fragrant, earthy finish.
What Makes This Sweet Potato Tart So Special?
This isn’t just another vegetable tart. It’s a delicious combination of seasonal ingredients that deliver restaurant-style flavour with home-cook simplicity.
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Flaky, golden pastry: Ready-made puff pastry creates a crisp, buttery foundation without the hassle of making pastry from scratch.
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Sweet and savoury layers: Roasted sweet potato and caramelized onions bring natural sweetness, balanced by creamy Brie and fragrant thyme.
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Festive colour and flavour: Ruby-red cranberries make every slice look beautiful, while their tartness cuts through the richness of the cheese.
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A crunchy finishing touch: Honey-glazed walnuts add texture, warmth, and a hint of cinnamon.
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Perfect for entertaining: Slice it into small squares for party finger food or larger portions for a satisfying vegetarian lunch.
For anyone collecting autumn tart recipes, easy puff pastry appetizers, or festive vegetarian recipes, this sweet potato and Brie tart is a lovely addition to the menu.
Recipe Highlights
PREP TIME
20 minutes
COOK TIME
40 minutes
TOTAL TIME
60 minutes
SERVINGS
6–8
OVEN
200°C
180°C fan / 400°F
DIFFICULTY
Easy
Ingredients You’ll Need
For the sweet potato tart
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1 sheet ready-rolled puff pastry, approximately 320 g
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1 large sweet potato, approximately 300 g, peeled and thinly sliced
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2 large onions, approximately 400 g, thinly sliced
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1 tablespoon olive oil
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1 tablespoon unsalted butter
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1 teaspoon fresh thyme leaves
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200 g Brie cheese, sliced
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⅓ cup dried cranberries, approximately 45 g
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½ teaspoon salt, or to taste
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¼ teaspoon freshly ground black pepper
For the honey walnut crunch
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⅓ cup walnuts, approximately 35 g, roughly chopped
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1 tablespoon unsalted butter
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2 tablespoons honey
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⅛ teaspoon ground cinnamon
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A small pinch of sea salt
Optional finishing touches
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Extra fresh thyme
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A handful of fresh rocket (arugula)
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Finely grated orange zest
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Cracked black pepper
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A light drizzle of hot honey
How to Make Sweet Potato Tart with Brie
Step 1: Caramelize the onions
Heat the olive oil and butter in a large skillet over medium-low heat. Add the sliced onions and a small pinch of salt.
Cook for 18–20 minutes, stirring regularly, until soft, deeply golden, and sweet. Add a splash of water if the onions begin sticking. Stir in the thyme and black pepper, then set aside.
Step 2: Prepare the sweet potato
Preheat the oven to 200°C conventional or 180°C fan. Line a large baking tray with parchment paper.
Slice the sweet potato into thin, even rounds, ideally around 3 mm thick. This helps the slices soften during baking without leaving the pastry underneath soggy.
Step 3: Assemble the tart
Unroll the puff pastry onto the prepared tray. Lightly score a border approximately 2 cm from the edges, taking care not to cut all the way through.
Spread the caramelized onions inside the border. Arrange the sweet potato slices over the onions, slightly overlapping them, then season lightly.
Step 4: Add Brie and cranberries
Arrange the Brie slices over the sweet potato and scatter the dried cranberries across the top.
Keep the pastry border relatively clear so it can puff up into a beautiful golden frame. Don’t overload the centre, as excess toppings can slow cooking.
Step 5: Bake until golden
Bake for approximately 25–35 minutes, checking from the 25-minute mark. The pastry should be puffed and golden, the cheese melted, and the sweet potato tender when pierced with a knife.
If the pastry browns before the sweet potato is tender, loosely cover the tart with foil and continue baking until cooked through.
Step 6: Make the honey walnut crunch
While the tart bakes, melt the tablespoon of butter in a small pan over medium-low heat. Add the walnuts and cook for 2–3 minutes, stirring frequently.
Stir in the honey, cinnamon, and sea salt. Cook for another 1–2 minutes until glossy and fragrant, then remove from the heat. Watch closely because honey can burn quickly.
Step 7: Finish and serve
Scatter the honey-glazed walnuts over the freshly baked tart. Add extra thyme, cracked black pepper, or a little orange zest if desired.
Rest for 5 minutes before slicing. Serve warm while the Brie is soft, the pastry is crisp, and the walnut topping is deliciously crunchy.
Pro Tips for the Best Sweet Potato Tart
1. Give your onions enough time
Caramelized onions are the flavour foundation of this recipe. Cooking them slowly develops their natural sweetness and creates a richer, more savoury filling.
Don’t rush them over high heat. Golden, soft onions deliver much more flavour than onions that are simply softened.
2. Keep the pastry crisp
A common problem with vegetable tart recipes is a soggy centre. The solution is to avoid piling on wet ingredients and to use thin, evenly sliced sweet potato.
Bake on a preheated metal tray if you want an extra-crisp base. Make sure your oven is fully heated before the tart goes in.
3. Choose Brie that melts beautifully
A ripe Brie gives you that creamy, luxurious texture that makes this autumn appetizer so appealing. Slice it evenly and distribute it across the tart rather than placing it all in one spot.
For a stronger flavour, try a more mature Brie. Camembert also works if you prefer a slightly earthier cheese.
4. Add the walnuts at the right moment
The honey walnut topping is best added after baking. This preserves more of its crunch and prevents the honey from becoming too dark in the oven.
For an extra-special Christmas appetizer, finish with orange zest and a few fresh thyme leaves.
5. Prepare ahead without losing the crunch
You can caramelize the onions up to three days in advance and refrigerate them in an airtight container. You can also slice the sweet potato shortly before assembly.
For the best results, assemble and bake the tart close to serving time. Puff pastry is at its finest when freshly baked.
Easy Variations to Try
One reason I love sweet potato tart recipes is how easily you can adapt them to different occasions.
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Add pecans: Swap the walnuts for pecans for a buttery, slightly sweeter crunch.
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Make it vegetarian-friendly: Check that your puff pastry and Brie use suitable vegetarian ingredients, including vegetarian-friendly cheese rennet.
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Try fresh cranberries: Use a small amount of lightly sweetened, cooked cranberries rather than scattering raw ones directly over the tart.
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Add greens: Scatter rocket over the finished tart for a fresh, peppery contrast.
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Make mini tartlets: Cut the pastry into smaller rectangles and adjust the baking time, checking early for golden edges and tender toppings.
These variations make the recipe useful for holiday party food, Thanksgiving side dishes, vegetarian Christmas recipes, and elegant weekend entertaining.
What to Serve with Sweet Potato and Brie Tart
Serve this tart as a starter alongside a crisp green salad with a light balsamic dressing. The acidity balances the rich cheese and buttery pastry beautifully.
For a relaxed autumn lunch, pair it with roasted vegetables or a bowl of warming vegetable soup. At a festive gathering, cut the tart into small squares and arrange them on a serving board with fresh thyme sprigs.
A little orange zest is especially lovely here. Its bright citrus aroma lifts the sweet potato, cranberries, and honey without overpowering the creamy Brie.
Storage and Reheating
Store leftover tart in an airtight container in the refrigerator for up to three days. Let it cool before covering, and keep any extra honey walnut topping separate when possible.
To reheat, place individual slices in an oven or air fryer at approximately 170°C until warmed through and crisp. The exact time will depend on slice size and your appliance.
Avoid microwaving if you want to preserve the flaky pastry. It will warm the filling, but the base is likely to become softer.
Freezing is possible, although the Brie and sweet potato textures may change slightly after thawing. For entertaining, freshly baked is the best option.
Frequently Asked Questions
Can I make this sweet potato tart without Brie?
Absolutely. Camembert offers a similar creamy texture, while goat’s cheese gives the tart a tangier flavour. Choose a cheese that balances the sweetness of the onions, sweet potato, cranberries, and honey.
Do I need to cook the sweet potato first?
Not necessarily. Thin slices should cook during the recommended baking time, but thicker pieces may remain firm. Slice them evenly and check for tenderness before removing the tart from the oven.
Can I use frozen puff pastry?
Yes. Thaw it according to the package instructions before assembling the tart. Keep it cool enough to handle easily, and avoid stretching it, which can affect how evenly it puffs.
Is this tart suitable for Christmas entertaining?
Definitely. The golden pastry, ruby cranberries, creamy Brie, and fragrant thyme create a festive presentation. You can serve it as a Christmas starter, a vegetarian buffet option, or a shareable holiday appetizer.
Nutrition Information
Estimated nutrition per serving, assuming eight servings:
| Nutrient | Approximate amount |
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| Calories | 350 kcal |
| Protein | 8 g |
| Carbohydrates | 32 g |
| Sugars | 12 g |
| Fat | 22 g |
| Saturated fat | 10 g |
| Fibre | 3 g |
| Sodium | 350 mg |
These figures are estimates based on the ingredients listed. Actual values will vary with the brand of puff pastry, the size of the sweet potato, the Brie used, and the amount of salt added.
Let’s Make This Gorgeous Autumn Tart!
This sweet potato tart with Brie, caramelized onions, cranberries, and honey walnuts proves that impressive entertaining food doesn’t have to be complicated.
You get crisp pastry, creamy melted cheese, naturally sweet vegetables, tart fruit, and a crunchy finish in every slice. It’s a winning combination for autumn gatherings, festive celebrations, and cosy lunches when you want something a little more exciting than an ordinary savoury tart.
Give it a try, make it your own with your favourite seasonal toppings, and share how it turned out. I’d love to know whether you went for the classic honey walnut crunch or added your own delicious twist!
