In a large bowl, mix the ground chicken with the egg, breadcrumbs, Parmesan cheese, and parsley. The mixture should be well blended, not too soft, and should not stick to the sides of the bowl. Add a little more breadcrumbs if necessary.
Place the mixture on a cling film sheet and form a rectangle. Arrange the blanched spinach leaves and cubed mozzarella cheese in the center, leaving the top border of the chicken mixture without filling.
Roll the meat with the help of the cling film to form a log (just like you would to make sushi rolls). Make sure it's well-sealed on all sides and tightly wrapped in cling film.
Transfer the chicken meatloaf to the fridge and refrigerate for 15 minutes.
Preheat oven to 175°C/350°F and arrange the oven tray onto the middle shelf.
Place overlapping slices of Parma ham on a cling film sheet. Carefully unwrap the refrigerated chicken meatloaf, place it over the Parma ham slices and roll it tightly to form a cylinder (just like you would to make sushi rolls). Make sure the meatloaf is nicely wrapped with Parma ham on all sides.
Transfer the meatloaf onto a baking sheet and bake it in the oven for 20-25 minutes.
Check if the meat is done with a meat thermometer, if it reaches 73°C/165°F you can safely remove it from the oven. Once ready, remove it from the oven, allow it to cool slightly, and serve with your favorite side dishes!