Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper.
Cut the brie cheese into smaller slices to easily fit inside the croissant dough.
Coarsely chop the walnuts and mix them with the honey in a bowl.
Roll out the puff pastry on a lightly floured surface, then cut it into equal-sized triangles.
Place a slice of brie cheese and a small dollop of honey-walnut mixture on the wider end of each triangle.
Carefully roll up the triangles into croissant shapes, starting from the wider end.
Brush the tops of the croissants with beaten egg, then sprinkle with finely chopped fresh rosemary.
Place the croissants on the parchment-lined baking sheet and bake for 20-25 minutes, or until golden brown.
Let the croissants cool for a few minutes, then serve them warm or slightly cooled.
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