pinwheels recipe

1 sheet of puff pastry (thawed if frozen) - 4 ounces cream cheese, softened - 1/2 cup shredded cheddar cheese - 1/4 cup finely chopped ham or turkey (optional) - 1/4 cup finely chopped spinach or any other leafy green - 1 tablespoon Dijon mustard (optional) - Salt and black pepper to taste - 1 egg (for egg wash)