Whisk the egg on a plate to create an egg dip
One at a time, dip each rice paper sheet into the beaten egg, coating evenly
Lay them out on a lightly oiled cutting board, slightly overlapping to create one large sheet
Lay out ham slices in a line across the sheet then top with shredded mozzarella
Roll up tightly into a cylinder, sealing the edge as you go
Gently curl it around itself into a compact spiral
Brush the top with any leftover egg and sprinkle generously with flaky salt
Bake at 400°F for 10-15 minutes until golden and crisp
