Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.

Open the package of croissant dough and carefully unroll it on a clean surface. Separate the triangles of dough.

If desired, spread a thin layer of Dijon mustard on each triangle for added flavor.

Place a slice of ham and a slice of cheese on the larger end of each triangle of dough.

Sprinkle a little freshly ground black pepper over the cheese for extra taste.

Starting from the larger end, roll each triangle of dough tightly toward the point, creating a croissant shape. Pinch the edges to seal.

Place the rolled croissants on the prepared baking sheet, ensuring they are spaced apart to allow for rising.

Brush the tops of the croissants with the beaten egg to achieve a golden finish.

Bake in the preheated oven for 12-15 minutes or until the croissants are puffed up and golden brown.

Once baked, remove from the oven and let them cool for a few minutes before serving.