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5.0 from 45 votes

Upside Down Onion Tart With Brie

Get ready to wow your friends and family with this upside down onion tart! Caramelized onions, creamy brie, and fresh thyme come together in a golden, flaky puff pastry that’s almost too pretty to eat (almost!). With dozens of 5-star reviews, this one’s guaranteed to make you look like a pastry pro.

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 fresh thyme
  • 8 pinches salt and pepper
  • 2 medium onions peeled and thinly sliced
  • 1 wheel Brie cheese cut into 8 triangles
  • 1 large egg

Instructions

    Cup of Yum
  1. 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.
  2. 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.
  3. 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.
  4. 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.

Notes

  • Try to flatten the parchment paper as much as possible before drizzling on oil and vinegar, which could leak around the tray if there are big creases in the paper. 
  • To store, let the tarts cool to room temperature. Place them in an airtight container or wrap them tightly with plastic wrap, then store them in the fridge for 2-3 days.
  • To reheat, pop them in the oven or air fryer to restore their crispness and warm them up. (It's best to consume the tarts when they're fresh for the optimal texture.)

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: 8tarts

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.