Clean potatoes and rub them in olive oil. Bake at 400° for 1 hour, flipping halfway through.
Cut potatoes lengthwise in half and scoop out most of the potato. Save insides for making mashed potatoes another time. Then cut each potato skin in half width-wise, and then each of those into 3 pieces lengthwise (basically, we just cut it into small triangles so they'd be like nachos).
Spread the potatoes on a cookie sheet skin side up and spread melted butter on skins and sprinkle with salt.
Set oven to broil and cook until crispy about 3-5 minutes. Flip skins over and cook until edges begin to darken, another 3-5 minutes.
Add desired toppings. Broil until cheese has melted. Add sour cream and serve immediately.