Thaw one sheet of frozen puff pastry overnight in the refrigerator. Roll it out into a rectangle approximately 10x12 inches.

Spread a layer of Dijon mustard across the pastry, leaving a 1/2-inch border. Layer deli ham over the mustard, then sprinkle grated cheese on top.

Roll up the pastry into a tight log, trim the ends, and wrap tightly in plastic wrap. Refrigerate for about 20 minutes.

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

Slice the pinwheel log into 1/2-inch pieces, arrange them on the baking sheets, and bake for approximately 18 minutes until golden brown.

Allow to cool slightly on a wire rack before serving. Garnish with fresh herbs if desired.