Preheat the oven to 400 degrees. Rub the potatoes lightly with olive oil and bake them on a foil-lined baking sheet until their skins are crisp and a fork easily slides into their flesh, about 1 hour. Transfer the potatoes to a wire rack and let cool for 10 minutes.
While the potatoes are cooking, assemble the toppings. Cook the bacon in a large skillet over medium heat until crisp, then transfer to a small bowl. Reserve the bacon fat. Grate the cheese into a small bowl; you should have about 2 cups. Trim and thinly slice the scallions. (Feeling frisky? Caramelize some onions. Shred some ham or grate some Gruyère.)
Using an oven mitt or a folded kitchen towel to handle the hot potatoes, cut each into quarters lengthwise to create four wedges. Using a small spoon, scoop the flesh from each wedge, leaving 1/4 inch or more of the flesh. (Save the scooped potatoes for another use, like potato pancakes or soup.)
Set the oven to broil. Return the wedges to the foil-lined baking sheet. Paint a bit of bacon fat on each, then top with cheese and bacon. Place under the broiler until the cheese is bubbling. Place the skins on a serving plate. Season with salt and pepper. Spoon a teaspoon or so of sour cream on each and scatter the scallions over the plate. Serve with hot sauce.