Caramel Apple & Brie Christmas Tree Tartlets

A cozy winter pastry, shaped like a tree and kissed with sweet magic.
1 sheet puff pastry, thawed
1 egg (for egg wash)
6 tbsp brie, rind removed, softened
2 firm apples (like Honeycrisp or Braeburn)
1 tbsp lemon juice
1 tbsp sugar
1/2 tsp cinnamon
