Steps

• Preheat oven to 400°F.
• Unroll the cold puff pastry and cut into 8 equal rectangles. For a smaller bite-size version, cut into additional pieces.
• Arrange rectangles on a baking sheet lined with the included parchment paper, leaving space between each.
• Add caramelized onions onto the puff pastry, leaving a border around the edges. Shortcut: Caramelized onion jam can replace the pre-caramelized onions. Use a thin layer because it is sweeter and more concentrated.
• Sprinkle Gruyere over the caramelized onions. Top with Parmesan and a few fresh thyme leaves.
• Fold the edges slightly inward around the filling to create a rustic crostata shape.
• Bake 15–20 minutes, or until puffed and deeply golden and the cheese is melted and bubbling.
• Finish with additional fresh thyme, if desired, and serve warm.

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