Preheat the oven to 425℉. Rub the olive oil onto the outside of the four potatoes and cut a small slit on the top of each potato. Bake for 45 minutes, or until the potatoes are soft. Let the potatoes cool until they can be handled- about 15 minutes. Increase the oven temperature to 475℉.
Cut the potatoes in half lengthwise and scoop out the cooked potato, leaving a ¼-inch shell. Save the cooked potato for another use (ie. mashed potatoes, hash browns, potato pancakes, etc). Place the potato skins on a baking sheet lined with parchment paper.
In a small bowl, combine the butter with the Parmesan and seasoned salt. Brush the butter mixture over both sides of the skins. Bake until crisp- about 4 minutes on each side.
Sprinkle the cheese and bacon inside the skins. Bake until the cheese is melted- about 2 minutes longer. Drizzle with sour cream and garnish with a few onions or chives, for garnish. Serve immediately.
Notes
Russet/baking potatoes work best for sturdy, crispy skins.
Leave about a ¼-inch shell when scooping so they hold their shape.
For the crispiest results, reheat leftovers in the oven (not the microwave).
Save the scooped potato for mashed potatoes, hash browns, or potato pancakes.