Preheat your oven to 375°F (190°C).
Unroll the crescent roll dough onto a flat surface.
Separate the dough into individual triangles.
Place a slice of ham on each triangle.
Add a slice of cheese on top of the ham.
Starting from the wide end, roll the dough tightly towards the point.
Place the rolled crescents on a baking sheet lined with parchment paper.
Beat the egg and brush it over the tops of the rolls.
Sprinkle sesame seeds on top if desired.
Bake for 12-15 minutes or until golden brown.