Preheat oven to 350F. Place dough on lightly floured surface, flatten, slightly with hands then roll into 12x8 in retangle with rolling pin. If dough is difficult to roll, cover with plastic wrap and let stand at room temperatur for 30 min before rolling out
top dough evenly with ham, overlapping slices slightly and leaving a 1/2 inch border around all sides
mix cheddar cheese and dressing spread evenly over ham
Moisten edges of dough with water. Starting at one of the long sides of dough, fold one third of the dough over the filing then repeat with the other long side of dough. Firmly pinch ends of the dough together to seal. Place, seam side down on lightly greased bakign sheet.
Cut 3 diagonal slits in the top of the dough using kitchen scissors. Brush evenly with egg, sprinkle with parmesan cheese. Bake 35-40 min or until golden brown, cool 10 min before cutting into 6 slices.