In a saucepan, melt the butter over medium heat, then add the granulated sugar and honey.
Stir until the sugar is completely dissolved and begins to caramelize.
Add the chopped walnuts and stir to coat them completely with the caramel.
Flavor with vanilla extract and cinnamon, then let the caramelized walnut mixture cool.
Roll out the puff pastry on a floured surface and cut it into equal-sized triangles.
Place a portion of the caramelized walnut filling 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 the beaten egg to ensure they bake to a beautiful golden brown.
Place the croissants on a baking sheet lined with parchment paper and bake for 20-25 minutes, or until golden brown.
Let the croissants cool for a few minutes, then serve dusted with powdered sugar.
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