Upside Down Potato Onion Tart

Transform simple ingredients into an elegant masterpiece with this Upside Down Potato Onion Tart, a savory treat that combines buttery Yukon gold potatoes, sweet caramelized onions, and golden puff pastry. Infused with fragrant fresh thyme and a touch of tangy balsamic vinegar, this tart delivers layers of bold, earthy flavors. The caramelized onions form a luscious base, while Parmesan cheese adds a salty, nutty finish to the potato layer, baked to perfection under a crisp, flaky pastry shell. Served warm or at room temperature, this visually stunning dish is perfect as a centerpiece appetizer or a satisfying brunch option. Whether you're hosting a dinner party or indulging in comfort food, this tart is sure to impress!

Nutriscore Rating: 65/100

Prep Time:20 mins

Cook Time:40 mins

Total Time:60 mins

Servings: 6

Ingredients

• 3 medium Yukon gold potatoes
• 1 Large yellow onion
• 2 tablespoons Unsalted butter
• 1 tablespoon Olive oil
• 1 teaspoon Fresh thyme leaves
• 0.5 teaspoon Salt
• 0.25 teaspoon Black pepper
• 1 teaspoon Balsamic vinegar
• 1 Puff pastry sheet (thawed)
• 1 tablespoon Flour (for dusting)
• 0.25 cup Grated Parmesan cheese

Directions

Step 1

Preheat your oven to 400°F (200°C).

Step 2

Peel the potatoes and slice them thinly into uniform round slices, about 1/8 inch thick. Set aside.

Step 3

Peel and thinly slice the onion into half-moons.

Step 4

In a heavy, oven-safe skillet (preferably cast iron, 9-10 inches in diameter), melt the butter and olive oil over medium heat.

Step 5

Add the sliced onions to the skillet and cook for about 5-7 minutes, stirring occasionally, until they soften and start to caramelize.

Step 6

Stir in the fresh thyme leaves, salt, pepper, and balsamic vinegar. Remove the skillet from heat and spread the onions evenly across the bottom.

Step 7

Place the potato slices in overlapping concentric circles over the onions, creating an even layer. Sprinkle Parmesan cheese evenly on top.

Step 8

On a floured surface, roll out the puff pastry sheet to slightly larger than the skillet size. Carefully lay the pastry over the potatoes and tuck the edges down around the inside of the skillet.

Step 9

Poke a few holes in the pastry with a fork to allow steam to escape during baking.

Step 10

Bake the tart in the preheated oven for 25-30 minutes, or until the puff pastry is golden brown and puffed.

Step 11

Remove the skillet from the oven and let it cool for 5-10 minutes.

Step 12

Carefully run a knife along the edge to loosen the tart. Place a large plate or serving platter over the skillet and invert the tart onto the plate.

Step 13

Serve warm or at room temperature. Enjoy your Upside Down Potato Onion Tart!

Nutrition Facts

Serving size	779.2 grams (779.2g)

Amount per serving	% Daily Value*
Calories	1442

Total Fat 79.90g	102%
Saturated Fat 37.70g	189%
Polyunsaturated Fat 1.30g
Cholesterol 82mg	27%
Sodium 2023mg	88%
Total Carbohydrate 168.40g	61%
Dietary Fiber 11.10g	40%
Total Sugars 8.40g
Protein 28.20g	56%

Vitamin D 0IU	0%
Calcium 331mg	25%
Iron 7mg	41%
Potassium 2627mg	56%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 47.8%

Protein: 7.5%

Carbs: 44.7%