Preheat your oven to 400°F (200°C).

On a lightly floured surface, roll out your puff pastry into a rectangle, about 1/8 inch thick.

Evenly layer slices of ham and shredded cheddar cheese across the rolled-out pastry, then sprinkle a thin layer of Dijon mustard.

Starting from one long edge, tightly roll the pastry up into a log. Wrap it in plastic wrap and refrigerate for about 30 minutes.

After chilling, cut the log into 1-inch thick pinwheels and arrange them on a baking sheet.

Bake in the preheated oven for 15-20 minutes, or until golden brown.

Let the pinwheels cool on a wire rack before serving warm.