Add the sliced potatoes to the slow cooker
Add table salt and boiling water
Brush the potatoes with melted butter to prevent browning
Press parchment paper on top to create a steamy environment
Cover and cook until potatoes are tender, 3 to 6 hours
Mash the potatoes in the slow cooker with the cooking liquid
Stir in sour cream, minced chives, and more melted butter
Keep warm until ready to serve
