cut potatoes in half lenghtwise; scoop out pulp, leaving a 1/4-in. shell (save pulp for another use). Place potatoes skins on a greased baking sheet.
Combine oil, parmesan cheese, salt, garlic powder, paprika and pepper; brush over both sides of skins.
Bake at 475 degrees for 7 minutes; turn. Bake until crisp, about 7 minutes more. sprinkle bacon and cheddar cheese inside skins. Bake 2 minutes longer or until the cheese is melted. Top with sour cream and onions. Serve immediately