Caramelized Onion and Cheese Tart

Caramelized Onion and Cheese Tart is a simple, tasty tart with sweet onions and rich cheese you will love.

Caramelized Onion and Cheese Tart — Introduction

This Caramelized Onion and Cheese Tart mixes sweet, slow-cooked onions with melting cheese on flaky puff pastry. It is great for a weeknight dinner, snack, or a small party.

If you enjoy bold onion flavors in other dishes, try the savory caramelized onion and garlic burger with creamy herb sauce for another easy recipe.

Why make Caramelized Onion and Cheese Tart

Make this Caramelized Onion and Cheese Tart because it is fast, impressive, and uses few ingredients. The tart looks fancy but needs little hands-on time.

It is flexible: you can change cheeses, herbs, or shape to fit what you have at home.

How to make Caramelized Onion and Cheese Tart

To make this Caramelized Onion and Cheese Tart, you first caramelize the onions, then build the tart on rolled puff pastry and bake until golden. The steps are simple and forgiving.

For a different but related baked onion dish, learn ideas from the cheesy caramelized onion and bacon potato gratin.

Ingredients for Caramelized Onion and Cheese Tart

• 2 tablespoons extra virgin olive oil
• 4 cups sliced onions (about 2-3 medium onions, sliced into 1/4-inch thick pieces)
• 1 tablespoon brown sugar
• 2 tablespoons balsamic vinegar
• 1/2 teaspoon salt
• 1/2 teaspoon pepper
• 8 ounces (1 sheet) frozen puff pastry, defrosted in the fridge for a couple of hours
• 2 ounces brie cheese, chilled, rind removed, and diced
• 2 ounces Gorgonzola or other blue cheese, diced
• 2 tablespoons fresh tarragon, chopped

Directions for Caramelized Onion and Cheese Tart

• Caramelize the Onions: Heat the olive oil in a large pan over medium-high heat. Add the sliced onions and cook about 10 minutes, stirring occasionally, until they begin to wilt and turn golden.
• Add flavor: Stir in the brown sugar, balsamic vinegar, salt, and pepper. Reduce heat to low and cook uncovered for 20–25 minutes, stirring now and then, until deeply caramelized. Add a splash of water if they dry out. Set aside to cool.
• Prepare the Puff Pastry: Preheat oven to 400°F (200°C). Roll the puff pastry into a rectangle about 10×14 inches. Place on a parchment-lined baking sheet. Prick the pastry all over at 2-inch intervals with a fork to limit puffing.
• Assemble the Tart: Spread the cooled caramelized onions evenly over the pastry to the edges. Dot with pieces of brie and Gorgonzola. Sprinkle chopped tarragon on top.
• Bake the Tart: Bake 18–20 minutes, until the cheese melts and the pastry is golden and crisp.
• Serve: Let cool about 5 minutes, then cut into wedges or squares and serve warm.

How to serve Caramelized Onion and Cheese Tart

Serve the Caramelized Onion and Cheese Tart warm so the cheese feels gooey and the pastry stays crisp. It pairs well with a green salad or a light soup.

For a cozy meal, serve the tart with a bowl of caramelized onion white bean chicken soup and some crusty bread.

How to store Caramelized Onion and Cheese Tart

Cool the tart completely before storing. Place slices in an airtight container and refrigerate up to 3 days.

To freeze, wrap cooled slices tightly in foil or plastic wrap and freeze up to 1 month. Reheat in a 350°F oven until warmed through to keep the pastry crisp.

Tips to make Caramelized Onion and Cheese Tart

• Use low heat to caramelize onions slowly for best sweetness and color.
• Slice onions evenly so they cook at the same rate.
• Chill the brie before dicing so it holds shape while you assemble.
• Prick the pastry to stop it from puffing too much in the oven.
• Let the tart cool a few minutes before cutting to avoid runny cheese.

Variation for Caramelized Onion and Cheese Tart

• Swap Gorgonzola for goat cheese or sharp cheddar for a different flavor.
• Add cooked bacon or caramelized mushrooms for extra taste.
• Use thyme or rosemary instead of tarragon for a different herb note.

FAQs about Caramelized Onion and Cheese Tart

Q: Can I make the onions ahead?
A: Yes. Caramelized onions keep in the fridge for 3–4 days and can be used when cool to assemble the tart.

Q: Can I use homemade pie crust instead of puff pastry?
A: Yes. A sturdy pie crust works, but the texture will be different—less flaky and more rustic.

Q: What tools do I need to make this tart?
A: You need a skillet for onions, rolling pin for the puff pastry, and a baking sheet. Buy it here if you want quick shopping options.

Caramelized Onion and Cheese Tart

A simple and tasty tart with sweet onions and rich cheese on flaky puff pastry, perfect for any occasion.

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Prep Time 15 minutes mins

Cook Time 45 minutes mins

Total Time 1 hour hr

Course Appetizer, Snack

Cuisine French

Servings 8 servings

Calories 250 kcal

Ingredients

  

For the Caramelized Onions

• 2 tablespoons extra virgin olive oil
• 4 cups sliced onions About 2-3 medium onions, sliced into 1/4-inch thick pieces.
• 1 tablespoon brown sugar
• 2 tablespoons balsamic vinegar
• 1/2 teaspoon salt
• 1/2 teaspoon pepper

For the Tart Assembly

• 8 ounces frozen puff pastry 1 sheet, defrosted in the fridge for a couple of hours.
• 2 ounces brie cheese Chilled, rind removed, and diced.
• 2 ounces Gorgonzola cheese Diced, or substitute with goat cheese or sharp cheddar.
• 2 tablespoons fresh tarragon Chopped, or substitute with thyme or rosemary.

Instructions

 

Caramelize the Onions

• Heat the olive oil in a large pan over medium-high heat.
• Add the sliced onions and cook about 10 minutes, stirring occasionally, until they begin to wilt and turn golden.
• Stir in the brown sugar, balsamic vinegar, salt, and pepper.
• Reduce heat to low and cook uncovered for 20–25 minutes, stirring now and then, until deeply caramelized. Add a splash of water if they dry out. Set aside to cool.

Prepare the Puff Pastry

• Preheat oven to 400°F (200°C).
• Roll the puff pastry into a rectangle about 10×14 inches.
• Place on a parchment-lined baking sheet.
• Prick the pastry all over at 2-inch intervals with a fork to limit puffing.

Assemble the Tart

• Spread the cooled caramelized onions evenly over the pastry to the edges.
• Dot with pieces of brie and Gorgonzola.
• Sprinkle chopped tarragon on top.

Bake the Tart

• Bake for 18–20 minutes, until the cheese melts and the pastry is golden and crisp.

Serve

• Let cool about 5 minutes, then cut into wedges or squares and serve warm.

Notes

For best results, use low heat to caramelize onions slowly for best sweetness and color. Chill the brie before dicing so it holds shape while you assemble. Prick the pastry to prevent excessive puffing.

Keyword Caramelized Onion Tart, Cheese Tart, Easy Tart Recipe, Puff Pastry Tart, Savory Tart