Add whiskey, butterscotch schnapps, canned sweet potatoes and nutmeg to a blender and whir until smooth. Pour into two shooter glasses and top with mini marshmallows. Brown the marshmallows to your liking, from a golden brown to a charred, blackened patina. Let cool for a moment and then swallow drink in one gluttonous mouthful. Give thanks to the fact that your favorite Turkey Day side dish now comes in convenient shot glass form.