Bake the potatoes for 1 hour, or until done, and let the potatoes cool at room temperature.
When they are cool enough to handle, cut off both ends and hollow out the potaotes, leaving the shells whole. Reserve the shells. Mash the potato flesh with the goat cheese, scallions and chipotle puree.
In a small saucepan, over medium heat, melt the butter with the milk; then beat it into the potato-cheese mixture and season to taste with salt and pepper. Stuff the reserved shells with the potato mixture.
When ready to serve, preheat oven to 400 degrees F. Place the stuffed potatoes on a baking sheet and bake for 15 minutes, or until hot.