Remove from oven; cut potatoes in half lengthwise. Carefully scoop out each potato, leaving about ½ inch of pulp inside shell. Mash pulp in large bowl. 
3
Mix in by hand remaining ingredients except parmesan cheese. Spoon mixture into potato shells. 
4
Sprinkle top with ¼ tsp parmesan cheese. 
5
Place on baking sheet and return to oven. Bake 15-20 minutes or until tops are golden brown.