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If you’re craving a dish that feels like a warm hug on a plate, this Sweet Potato, Feta & Caramelized Onion Tart Recipe will quickly become your new favorite. With its flaky puff pastry base, tender roasted sweet potatoes, sweet and deeply caramelized onions, and tangy feta cheese, every bite offers a delightful balance of flavors and textures that’s simply irresistible. Whether you’re serving it for a cozy family dinner or impressing guests at brunch, this tart is a shining example of how simple ingredients can create an unforgettable dish.

Ingredients You’ll Need
Don’t be fooled by the simplicity of this ingredient list. Each component plays a crucial role in building layers of flavor, texture, and color that make this tart absolutely scrumptious. Plus, most of these pantry staples come together easily, making it a straightforward recipe to whip up any day of the week.
- Puff pastry sheet: Provides a flaky, buttery base that crisps perfectly in the oven.
- Sweet potatoes: Their natural sweetness and creamy texture are the heart of this tart.
- Olive oil: Adds a subtle richness and helps roast the sweet potatoes beautifully.
- Salt and black pepper: Essential seasonings to enhance every flavor layer.
- Large onion: When caramelized, it delivers a luscious, sweet-savory element.
- Butter: Helps soften and brown the onions for that irresistible caramelization.
- Brown sugar: Deepens the sweetness of the onions and creates that classic golden color.
- Feta cheese: Adds tangy, salty bursts that contrast perfectly with the sweet potatoes and onions.
- Fresh thyme leaves: A fresh herbaceous note that lifts the entire dish.
- Egg (beaten): Used as an egg wash to give the pastry crust a gorgeous golden sheen.
How to Make Sweet Potato, Feta & Caramelized Onion Tart Recipe
Step 1: Roast the Sweet Potatoes
Start by preheating your oven to 400°F (200°C) and lining a baking sheet with parchment paper to prevent any sticking. Toss those thinly sliced sweet potatoes with olive oil, salt, and pepper to season them perfectly. Roasting for 20 minutes softens the sweet potatoes while bringing out their natural sweetness, setting you up for a melt-in-your-mouth texture later.
Step 2: Caramelize the Onions
While the sweet potatoes roast, melt butter in a skillet over medium heat. Add your thinly sliced onions and cook them slowly until they soften and start to turn golden. Sprinkle in the brown sugar to help the onions caramelize evenly, stirring occasionally. This process takes about 15 minutes and creates those sweet, sticky onions that add incredible depth to the tart’s flavor.
Step 3: Prepare the Puff Pastry Base
Lightly flour your surface and roll out the thawed puff pastry just a bit to smooth it out. Then, on the baking sheet, create a 1-inch border by scoring the edges with a knife—this will help the center ingredients stay put while allowing the border to puff up beautifully and become wonderfully crisp.
Step 4: Assemble the Tart
Spread the caramelized onions evenly inside the scored border, creating a sweet and savory bed. Then layer the roasted sweet potato slices on top in a neat arrangement. Sprinkle the crumbled feta generously and dot with fresh thyme leaves for that bright, herbal finish.
Step 5: Bake to Perfection
Brush the pastry border with the beaten egg to give it a stunning golden color once baked. Pop the tart into your preheated oven and bake for 20 to 25 minutes until the pastry is puffed, golden, and utterly inviting. When it comes out of the oven, let it cool slightly so the flavors settle before slicing.
How to Serve Sweet Potato, Feta & Caramelized Onion Tart Recipe

Garnishes
A sprinkle of fresh thyme leaves or even some chopped parsley brightens the presentation and adds a fresh contrast to the richness of the tart. A light drizzle of good-quality extra virgin olive oil or a few dashes of balsamic glaze also bring lovely finishing touches.
Side Dishes
This tart pairs wonderfully with a crisp green salad dressed with lemon vinaigrette or a simple bowl of mixed greens tossed with walnuts and dried cranberries. For a heartier meal, serve alongside roasted chicken or a creamy soup to enjoy complementary textures and flavors.
Creative Ways to Present
For a stunning appetizer, slice the Sweet Potato, Feta & Caramelized Onion Tart Recipe into small squares or rectangles and serve on a wooden board with a sprinkle of fresh herbs. You can also add some toasted pine nuts or a scattering of pomegranate seeds for extra crunch and bursts of color that make this dish party-ready.
Make Ahead and Storage
Storing Leftovers
Wrap leftover tart tightly in plastic wrap or foil and store it in the refrigerator. Properly stored, it will stay fresh for up to 3 days, making it great for easy lunches or a quick dinner on busy days.
Freezing
The tart can be frozen for longer storage. After baking, cool it completely, then wrap it in plastic wrap and foil or place in an airtight container before freezing. It will keep well for up to one month. To enjoy, thaw overnight in the refrigerator before reheating.
Reheating
Warm your tart in a preheated oven at 350°F (175°C) for about 10 to 15 minutes. This helps refresh the crispiness of the puff pastry while gently reheating the filling without drying it out. Avoid microwaving if possible, as it can make the pastry soggy.
FAQs
Can I use fresh onions instead of caramelized onions?
While you technically can, the rich, sweet depth that caramelized onions bring to the tart is difficult to replicate with raw onions. Caramelizing adds natural sweetness and a tender texture that perfectly complements the sweet potatoes and feta.
Is there a substitute for feta cheese?
If feta isn’t your favorite or you want a milder taste, goat cheese or ricotta could work nicely. Just keep in mind the salty tang feta adds really balances the sweetness, so adjusting seasoning might be needed.
Can I make this tart gluten-free?
Yes! Swap out the puff pastry for a gluten-free version available at many grocery stores, or make your own gluten-free crust. The rest of the ingredients are naturally gluten-free, so it’s easy to adapt.
What’s the best way to slice the tart?
Use a sharp knife and slice gently to avoid squashing the puff pastry. A pizza cutter works well too for clean, easy slices that keep the layering intact.
Can I add other herbs or spices to this recipe?
Absolutely! Rosemary pairs beautifully with sweet potato, or a hint of smoked paprika can add a subtle warmth. Feel free to experiment to make it your own, but thyme’s freshness really shines in the classic version.
Final Thoughts
I truly hope you give this Sweet Potato, Feta & Caramelized Onion Tart Recipe a whirl because it’s one of those dishes that feels special yet is so easy to make. The combination of flavors, textures, and beautiful presentation makes it perfect for any occasion, whether a casual dinner or something a bit more festive. Once you make it, you’ll find yourself reaching for this recipe again and again to bring a little magic to your table.
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Sweet Potato, Feta & Caramelized Onion Tart Recipe
- Prep Time: 15 minutes
- Cook Time: 45 minutes
- Total Time: 1 hour
- Yield: 6 servings
- Category: Main Course
- Method: Baking
- Cuisine: Mediterranean
- Diet: Vegetarian
Description
A delicious and visually appealing tart featuring tender roasted sweet potatoes, sweet caramelized onions, and tangy crumbled feta cheese on a flaky puff pastry base, garnished with fresh thyme. Perfect as a savory appetizer or light meal.
Ingredients
Puff Pastry
- 1 sheet puff pastry, thawed
Sweet Potato
- 2 medium sweet potatoes, peeled and sliced thin
- 1 tbsp olive oil
- Salt and black pepper, to taste
Caramelized Onions
- 1 large onion, thinly sliced
- 1 tbsp butter
- 1 tsp brown sugar
Toppings and Garnish
- 4 oz feta cheese, crumbled
- 1 tsp fresh thyme leaves
- 1 egg, beaten (for egg wash)
Instructions
- Preheat and Prepare Baking Sheet: Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper to prevent sticking and for easy cleanup.
- Roast Sweet Potatoes: Toss the thinly sliced sweet potatoes with olive oil, salt, and black pepper to ensure even seasoning. Spread them out on the prepared baking sheet and roast in the oven for 20 minutes until tender. Remove and set aside.
- Caramelize Onions: In a skillet over medium heat, melt the butter and add the sliced onions. Cook slowly, stirring occasionally, until the onions become soft. Sprinkle in the brown sugar and continue cooking for about 15 minutes until the onions turn golden and caramelized. Remove from heat and set aside.
- Prepare Puff Pastry Base: On a lightly floured surface, gently roll out the thawed puff pastry slightly to even the thickness. Transfer it onto the lined baking sheet and score a 1-inch border around the edges without cutting all the way through to create a raised crust when baked.
- Assemble Tart: Spread the caramelized onions evenly within the scored border. Arrange the roasted sweet potato slices on top of the onions, then sprinkle the crumbled feta cheese evenly over the tart. Finally, scatter fresh thyme leaves over the top for added aroma and flavor.
- Apply Egg Wash and Bake: Brush the exposed pastry border with the beaten egg to achieve a golden, glossy finish during baking. Place the tart in the oven and bake for 20 to 25 minutes until the pastry is puffed up and beautifully golden brown.
- Cool and Serve: Allow the tart to cool slightly before slicing. Serve warm or at room temperature for the best taste and texture.
Notes
- Ensure sweet potato slices are uniform in thickness for even roasting.
- Caramelizing onions slowly enhances their sweetness and depth of flavor.
- Use fresh thyme for the best aromatic impact; dried thyme can be substituted but in lesser quantities.
- This tart can be served as a main dish or a side, and pairs well with a crisp green salad.
- Leftovers can be refrigerated and gently reheated in the oven to maintain crispness.

