Spray counter lightly with non-stick cooking spray. Roll loaf or combined rolls into a 10x14-inch rectangle. Cover with plastic wrap and let rest for about 10 minutes.
Remove wrap and spread dough with mustard. Sprinkle with ham and cheese.
Roll up jelly roll style starting with a long side. Place, seam side down, on a sprayed baking pan. Using a sharp, serrated knife cut some vents in the top. Brush with egg and sprinkle with sesame seeds.
Bake at 350°F 30-35 minutes..