Packed with caramelized onions, creamy brie, and fragrant thyme, all baked in a flaky puff pastry, this upside down onion tart is a show-stopping dish that's sure to impress.
Course Appetizers, Snacks
Cuisine American, Mediterranean
Diet Halal, Vegetarian
Keyword onion tart, onion tarts, savory tart, upside down tart
Prep: If frozen, let pastry thaw on the counter until soft and pliable. Once thawed, cut into 8 equal squares. Preheat oven to 400°F (204°C). Slice the onion and remove thyme leaves from 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, or until golden brown and cooked through. Let cool on the baking sheet for a few minutes before trying to remove from the parchment.
Video
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.