Ham and Cheese Puff Pastry Pinwheels

Ingredients:

Puff Pastry: 1 sheet (about 250 g), thawed
Ham: 150 g (6 slices), thinly sliced
Cheese: 1 cup (100 g), shredded (cheddar, mozzarella, or your choice)
Mustard: 2 tbsp (optional, for extra flavor)
Egg: 1, beaten (for egg wash)
Fresh parsley: 1 tbsp, chopped (optional, for garnish)
Salt and pepper: to taste
Instructions: