Preheat your oven to 375°F (190°C).

Place the round of Brie cheese on a baking sheet lined with parchment paper.

In a bowl, combine the cranberry sauce, chopped nuts, brown sugar, and cinnamon. Mix until well combined.

Spread the cranberry mixture evenly over the top of the Brie.

Roll out the puff pastry on a lightly floured surface. Cut it to fit around the Brie. Wrap the pastry around the cheese, sealing the edges.

Brush the beaten egg over the pastry to give it a golden color when baked.

Place the Brie in the preheated oven and bake for 15-20 minutes or until the pastry is golden brown.

Remove from the oven and allow it to cool for a few minutes before serving.

Transfer to a serving platter and pair with crackers or sliced baguette.