Prep the Oven & Pastry
Preheat oven to 400°F (200°C). Line two baking sheets with parchment paper.
Slice puff pastry into squares—typically 6 squares per sheet. Set aside.
Build the Flavor Base
On each baking sheet, make 6 small pools of olive oil (12 total).
Drizzle a bit of balsamic glaze into each pool.
Layer the Onions & Cheese
Place one onion slice over each pool. Season with garlic powder, salt, and pepper.
Top each onion with a slice of Swiss cheese and a sprinkle of Parmesan.
Seal with Pastry
Place a pastry square over each stack, gently pressing and crimping the edges to fully enclose the filling.
Brush the tops with egg white for a golden finish.
Bake & Flip
Bake for 12–15 minutes, or until pastry is puffed and golden brown.
Let cool for at least 5 minutes before flipping to reveal the caramelized onion base.
Finish & Serve
Optional: Drizzle with extra balsamic glaze for added depth and shine.
Serve warm and enjoy the layers of flavor and texture.
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