Preheat oven to 190°C/375°F/Gas 5.
Open thawed puff pastry and carefully unfold, being careful not to crack it. Place puff pastry on a lightly floured surface. Gently roll pastry with a floured rolling pin into a large rectangle.
Cut in half with a sharp knife and carefully wrap one portion in plastic before returning to the refrigerator. (Use the remaining portion within a day for another recipe, to double this one, or to create a lid for this tart).
Place the remaining rectangle on a large, rimmed baking sheet lined with parchment paper or a nonstick baking mat.
Tip: To create a picture frame effect as shown, cut around the perimeter of the sheet with a sharp knife about 1/2” from the outside edge, but do not cut all the way through.
Dock (pierce) the pastry inside the cut you just made with a fork just like you would a pie crust. Place the sliced pears and brie in single layers on the interior pastry. Sprinkled with cinnamon and nutmeg, and drizzle with maple syrup.
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If adding a pastry lid, lay it on top and cut slits on the top to allow steam to escape.
Create an egg wash by whisking one tablespoon of water with one egg yolk. Brush mixture over the exposed portion of the puff pastry before placing it in the oven.
Bake for approximately 15-18 minutes, or until the pastry “picture frame” puffs up and turns golden brown. Remove from oven and cool slightly before slicing and serving. Enjoy!
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