Preheat your oven to 200°C (400°F) and line a baking sheet with parchment paper.
Roll out the puff pastry sheet on a lightly floured surface into a rectangular shape (if it’s not already).
Add the Filling:
Spread a thin layer of mustard over the puff pastry (optional).
Evenly layer the ham slices on top of the mustard.
Sprinkle the shredded cheese evenly over the ham.
Sprinkle dried herbs over the cheese, if desired.
Roll and Slice:
Roll the pastry tightly from one long edge to the other to form a log.
Using a sharp knife, slice the log into 12 equal pieces.
Assemble and Bake:
Place the pinwheels flat-side down on the prepared baking sheet, spacing them about 2 inches apart.
Brush the tops with the beaten egg for a golden finish.
Bake in the preheated oven for 18-20 minutes, or until the pastry is puffed and golden brown.
Serve:
Remove from the oven and let cool slightly before serving. Serve warm or at room temperature.
