There's something almost magical about the moment sweet, jammy caramelized onions meet tangy, creamy goat cheese on a sheet of golden, flaky puff pastry. This caramelized onion goat cheese tart looks bakery-worthy, yet comes together with shockingly little effort.

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Caramelized Onion and Goat Cheese Puff Pastry Tart

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A flaky puff pastry tart topped with sweet caramelized onions, creamy goat cheese, and fresh thyme for an elegant sweet-savory bite.

Total Time: 1 hour 10 minutes
Yield: 4 1x

Ingredients

Scale

1 sheet puff pastry, thawed
3 tablespoons unsalted butter
4 large yellow onions, thinly sliced
1 teaspoon salt, divided
1 teaspoon sugar
1 tablespoon balsamic vinegar
4 ounces goat cheese, crumbled
2 teaspoons fresh thyme leaves, plus more for garnish
1 egg, beaten (for egg wash)
1 tablespoon olive oil
Freshly cracked black pepper, to taste
2 tablespoons honey, for drizzling (optional)

Instructions

Melt the butter with olive oil in a large skillet over medium heat. Add the sliced onions and 1/2 teaspoon salt, stirring to coat.
Cook the onions, stirring occasionally, for 30-35 minutes over medium-low heat until deeply golden and jammy, lowering the heat if they start to brown too quickly.
Stir in the sugar and balsamic vinegar during the last 5 minutes of cooking, then remove from heat and let cool slightly.
Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
Roll out the puff pastry on the prepared baking sheet and score a border about 1/2 inch from the edges, being careful not to cut all the way through.
Brush the border with beaten egg, then prick the center of the pastry all over with a fork.
Spread the caramelized onions evenly over the center of the pastry, staying inside the scored border.
Scatter the crumbled goat cheese and fresh thyme leaves over the onions, then season with the remaining salt and black pepper.
Bake for 20-25 minutes, until the pastry is puffed and golden brown.
Let the tart cool for 5 minutes, drizzle with honey if desired, garnish with extra thyme, then slice and serve warm.

Notes

Slice the onions uniformly for even caramelizing, and resist the urge to rush the process over high heat — low and slow is key to that deep, jammy sweetness. Leftovers keep in the fridge for up to 2 days and reheat well in a 350°F oven for 8-10 minutes to re-crisp the pastry.

Author: Ella Whitley
Prep Time: 15 minutes
Cook Time: 55 minutes
Method: Baking
Cuisine: French

Frequently Asked Questions

What makes the best caramelized onion goat cheese tart?

The secret to the best caramelized onion goat cheese tart is patience: cook the onions low and slow for a full 30 minutes so their natural sugars develop deep, jammy sweetness before adding the tangy goat cheese and baking on flaky puff pastry.

Can I make this tart ahead of time?

Yes, you can caramelize the onions up to 3 days in advance and store them in the fridge. Assemble the tart with the pastry and goat cheese just before baking for the flakiest, freshest result.

What can I substitute for goat cheese in this tart?

If you're not a fan of goat cheese, try substituting brie, feta, or a soft herbed cream cheese for a similar creamy, tangy contrast to the sweet caramelized onions.

Why is my puff pastry not puffing up properly?

Make sure your puff pastry is cold when it goes into a hot, fully preheated oven, and avoid overloading the center with too many wet toppings, which can weigh down the layers and prevent a proper rise.

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