Sweet Potato & Caramelized Onion Tart with Brie, Cranberries & Walnut Honey Crunch

Sweet Potato & Caramelized Onion Tart with Brie, Cranberries & Walnut Honey Crunch is an elegant sweet-and-savory tart featuring flaky puff pastry, tender roasted sweet potatoes, deeply caramelized onions, creamy Brie, tart cranberries, and a crunchy walnut honey topping.

Every bite brings together buttery pastry, melty cheese, naturally sweet vegetables, bright citrusy cranberries, and lightly caramelized walnuts. It’s beautiful enough for a holiday table but simple enough for a cozy weekend brunch.

Ingredients

For the Tart

• 1 sheet (about 225 g) puff pastry, thawed
• 2 medium sweet potatoes (about 500 g), peeled and thinly sliced
• 1 large yellow onion, thinly sliced
• 6 oz (170 g) Brie cheese, thinly sliced
• 2 tbsp olive oil
• 1 tbsp butter
• 1 tbsp honey
• 1 tsp fresh thyme leaves
• 1/2 tsp garlic powder
• 1/2 tsp salt
• 1/4 tsp black pepper

For the Walnut Honey Crunch

• 1/2 cup (60 g) walnuts, roughly chopped
• 2 tbsp honey
• 1 tbsp brown sugar
• 1 tbsp butter
• 1/4 tsp cinnamon
• Pinch of salt

For the Cranberry Topping

• 1/3 cup (50 g) dried cranberries
• 1 tbsp orange juice
• 1 tsp orange zest

For Garnishing

• 1 tbsp fresh thyme leaves
• 1 tbsp honey, for drizzling
• 1 tbsp chopped walnuts

How to Make It

1. Prepare the Sweet Potatoes

Preheat your oven to 400°F (200°C). Peel the sweet potatoes and slice them very thinly and evenly. Place them in a bowl and toss with 1 tbsp olive oil, garlic powder, salt, and black pepper until evenly coated.

2. Caramelize the Onion

Heat the butter and remaining olive oil in a large skillet over medium-low heat. Add the sliced onion and cook for 15–20 minutes, stirring occasionally, until soft, deeply golden, and caramelized.

Stir in 1 tbsp honey and cook for another 1–2 minutes. Remove from the heat and set aside.

3. Prepare the Cranberries

Add the dried cranberries to a small bowl. Toss them with the orange juice and orange zest, then let them sit for 5–10 minutes. This softens the cranberries slightly and gives them a bright citrus flavour.

4. Prepare the Puff Pastry

Place the thawed puff pastry on a parchment-lined baking sheet. Lightly score a 1-inch (2.5 cm) border around the edges without cutting completely through the pastry.

Prick the center several times with a fork. This helps prevent the middle of the pastry from puffing excessively while allowing the border to rise beautifully.

5. Add the Caramelized Onion

Spread the caramelized onions evenly over the center of the puff pastry, keeping the scored border clear. Distribute them in a thin, even layer.

6. Arrange the Sweet Potatoes

Arrange the seasoned sweet potato slices over the onions in slightly overlapping rows or a decorative pattern. Try to keep the slices relatively even so they roast at the same rate.

7. Add the Brie

Tuck the Brie slices between and over the sweet potato slices. Sprinkle the fresh thyme evenly over the tart.

8. Bake the Tart

Bake for 25–30 minutes, until the puff pastry is crisp and golden, the sweet potatoes are tender, and the Brie is melted and bubbling.

If the pastry edges begin browning too quickly, loosely cover them with foil for the remainder of the baking time.

9. Make the Walnut Honey Crunch

While the tart bakes, melt the butter in a small skillet over medium-low heat. Add the chopped walnuts, brown sugar, cinnamon, and salt.

Toast for 2–3 minutes, stirring frequently. Drizzle in the honey and continue stirring for another 1–2 minutes, until the walnuts are glossy and lightly caramelized. Remove from the heat and let cool slightly.

10. Add the Cranberries

Remove the baked tart from the oven. Scatter the orange-infused cranberries over the melted Brie and roasted sweet potatoes while the tart is still warm.

11. Add the Walnut Crunch

Sprinkle the walnut honey crunch generously over the tart, concentrating it over the Brie and sweet potato layers so every slice gets plenty of crunchy topping.

12. Finish with Honey

Drizzle a small amount of honey over the top. Finish with fresh thyme leaves and extra chopped walnuts for a beautiful final presentation.

13. Rest and Serve

Let the tart rest for 5–10 minutes before slicing. Serve warm or at room temperature as an elegant appetizer, brunch dish, holiday side, or festive vegetarian main course.

Why This Recipe Works

This tart is built around a delicious balance of sweet, salty, creamy, and crunchy textures. The puff pastry provides a crisp, buttery foundation, while caramelized onions add deep savoury sweetness.

Tender sweet potatoes bring natural sweetness and colour, while melted Brie adds a rich, creamy element. Tart cranberries and orange brighten the dish, keeping the sweetness from becoming overwhelming.

The walnut honey crunch provides the finishing touch. Toasted walnuts, brown sugar, cinnamon, and honey create a lightly caramelized topping that adds irresistible texture to every bite.

Tips for the Best Sweet Potato Tart

• Slice the sweet potatoes thinly: Thin, even slices cook more quickly and create a beautiful layered appearance.
• Caramelize the onions slowly: Cooking them over medium-low heat develops deeper flavour and a naturally sweet finish.
• Keep the pastry cold: Chilled puff pastry tends to produce better layers and a crispier crust.
• Don’t overload the center: Too many toppings can make the pastry soggy, so keep the layers relatively thin.
• Use ripe Brie: A good-quality Brie melts beautifully and provides a rich contrast to the sweet potatoes.
• Watch the walnuts carefully: Honey and sugar can caramelize quickly, so keep the heat low and stir frequently.
• Rest before slicing: A short resting period allows the melted cheese and toppings to settle and makes the tart easier to cut.

Serving Suggestions

This tart makes a gorgeous appetizer for Thanksgiving, Christmas, or any festive gathering. Cut it into small squares and serve it as a party bite alongside olives, nuts, fruit, or a simple green salad.

For brunch or lunch, serve a larger slice with a crisp salad dressed with lemon vinaigrette. It also pairs beautifully with roasted chicken, turkey, or a bowl of seasonal soup.

Frequently Asked Questions

Can I prepare this tart ahead of time?

Yes. You can caramelize the onions, prepare the cranberries, and slice the sweet potatoes ahead of time. Assemble and bake the tart shortly before serving for the crispest pastry.

Can I use another cheese instead of Brie?

Yes. Camembert is an excellent substitute. Goat cheese can also work, although it will provide a tangier flavour and won’t melt in quite the same way as Brie.

Can I use pecans instead of walnuts?

Absolutely. Pecans are a delicious substitute and pair especially well with sweet potatoes, Brie, cranberries, and honey.

How do I keep the puff pastry from becoming soggy?

Make sure the caramelized onions aren’t excessively wet and avoid adding too much topping. Pricking the center of the pastry and baking it until deeply golden also helps create a crisp base.

Can I use fresh cranberries?

Dried cranberries are recommended for this recipe because they provide a concentrated sweet-tart flavour and chewy texture. If using fresh cranberries, they may need to be cooked or sweetened first.

Can I serve the tart at room temperature?

Yes. The tart is delicious warm or at room temperature, making it particularly convenient for parties, brunches, and holiday gatherings.

Nutrition & Timing

Details	Amount
Prep Time	20 minutes
Cook Time	35 minutes
Total Time	55 minutes
Servings	6
Calories	Approx. 430 per serving
Protein	Approx. 10g per serving

Final Thoughts

Sweet Potato & Caramelized Onion Tart with Brie, Cranberries & Walnut Honey Crunch is a stunning combination of simple ingredients transformed into something special. The flaky puff pastry, creamy melted Brie, caramelized onions, and tender sweet potatoes create a rich and satisfying base.

Then come the orange-infused cranberries and crunchy honey walnuts, adding bright fruitiness and irresistible texture. Finished with fresh thyme and a delicate honey drizzle, this tart is the kind of dish that looks impressive on the table and disappears quickly once everyone starts eating.

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