Wash, peel, and dice the apple into small cubes.
Melt the butter in a skillet over medium heat, then add the diced apple, granulated sugar, and cinnamon.
Stir for a few minutes until the apple softens and the sugar slightly caramelizes.
Add the vanilla extract and honey, stir to combine, and let it cool completely.
Roll out the puff pastry on a lightly floured surface and cut it into equal-sized triangles.
Place a spoonful of the cinnamon-apple filling onto 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 achieve a beautiful golden-brown color.
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 dust them with powdered sugar before serving.
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