5 from 30 votes
Upside Down Onion Tart With Brie
This tart features thinly sliced onions and wedges of creamy Brie topped with puff pastry, baked until golden and rich. Balsamic glaze and fresh thyme infuse the onion layer with sweet and herbaceous notes, while the puff pastry creates a flaky, buttery crust. Brushing the pastry with egg wash enhances the golden finish. The tart is a savory treat combining soft melting cheese with caramelized onion flavors.
Prep Time
15 mins
Cook Time
15 mins
Total Time
30 mins
Servings:
8
tarts
Calories:
349 kcal
Course:
Appetizer, Snacks
Cuisine:
Mediterranean, American
Ingredients
- 1 .3 oz package puff pastry 2 sheets, 490 g
- 4 Tbsp olive oil 60 mL
- 4 Tbsp balsamic glaze 60 mL
- 8 prigs thyme fresh
- 8 pinches salt
- 8 pinches black pepper
- 2 medium onion peeled and thinly sliced
- 1 wheel Brie cheese cut into 8 triangles
- 1 large egg
Instructions
- Prep: If frozen, let the puff pastry thaw on the counter until soft and pliable. Once thawed, cut into 8 equal squares. Preheat the oven to 400°F (204°C). Slice the onion and remove the thyme leaves from their stems.
- Layer: Line a large baking sheet with parchment paper. Drizzle oil equally around the baking sheet to make 8 little puddles. Drizzle on balsamic. Top each with an onion slice. Sprinkle on thyme leaves, salt, and pepper. Top with a slice of brie.
- Cover: Top each mound with the puff pastry, pressing the edges down to completely cover the cheese and onion. Whisk the egg together, then brush it over the pastry.
- Bake: Bake on the middle rack for 15 minutes until golden brown and cooked through. Let cool on the baking sheet for a few minutes before trying to remove from the parchment.
Cup of Yum
Notes
- Flatten parchment paper completely before adding oil and balsamic glaze to avoid spills during baking.
- Store cooled tarts in an airtight container in the refrigerator for 2-3 days.
- Reheat in the oven or air fryer to refresh the crispness of the puff pastry.
- For best texture, consume the tarts fresh after baking.
Nutrition Information
Serving
1onion tart
Calories
349kcal
(17%)
Carbohydrates
18g
(6%)
Protein
7.3g
(15%)
Fat
27.5g
(42%)
Saturated Fat
8g
(40%)
Cholesterol
43mg
(14%)
Sodium
492mg
(21%)
Potassium
74mg
(2%)
Fiber
1.4g
(6%)
Sugar
3g
(6%)
Calcium
132mg
(13%)
Iron
3mg
(17%)
Nutrition Facts
Serving: 8 tarts
Amount Per Serving
Calories 349
% Daily Value*
| Serving | 1onion tart | |
| Calories | 349kcal | 17% |
| Carbohydrates | 18g | 6% |
| Protein | 7.3g | 15% |
| Fat | 27.5g | 42% |
| Saturated Fat | 8g | 40% |
| Cholesterol | 43mg | 14% |
| Sodium | 492mg | 21% |
| Potassium | 74mg | 2% |
| Fiber | 1.4g | 6% |
| Sugar | 3g | 6% |
| Calcium | 132mg | 13% |
| Iron | 3mg | 17% |
* Percent Daily Values are based on a 2,000 calorie diet.