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Preheat your oven according to the puff pastry package instructions.
Roll out the puff pastry sheet on a lightly floured surface.
Cut the pastry into four triangles.
Place a slice of ham and a slice of cheese on each triangle.
Roll up each triangle, starting from the wide end and ending at the tip.
Place the rolled croissants on a baking sheet lined with parchment paper, seam side down.
Brush the croissants with the beaten egg to give them a nice golden color when baked. You can also sprinkle sesame seeds on top if you like.
