Preheat an oven to 450 degrees F (230 degrees C). Prick potatoes several times with a fork and place onto a baking sheet.
Bake in the preheated oven until potatoes are easily pierced with a fork, 50 minutes to 1 hour. Let cool enough to handle, about 10 minutes.
Increase oven temperature to 475 degrees F (245 degrees C). Line a baking sheet with foil.
Cut the potatoes in half lengthwise; scoop out the flesh using a melon baller leaving 1/4 inch in the shell. Reserve flesh for another use.
Combine oil, Parmesan cheese, salt, garlic power, paprika, and pepper in a bowl. Brush over both sides of the potato skins. Place on the prepared baking sheet.
Bake in the preheated oven for 7 minutes. Flip and continue to bake until crisp, about 7 minutes more. Remove from the oven; sprinkle with bacon pieces and Cheddar cheese. Bake until cheese is melted, about 2 minutes. Top with sour cream and green onions.