Preheat oven 400°F.
Place potatoes on a baking sheet and drizzle with some EVOO.
Prick them with fork, sprinkle with some salt and bake in oven for 40 minutes or until the potatoes are cooked through and tender.
Remove tender potatoes from oven, cut in half lengthwise and carefully scoop out the flesh from each half, preserving the integrity of the skin halves.
Place the potato flesh in a bowl and mash with the milk, adding just a little at a time. Add in the blue cheese and scallions and season with salt and pepper. With a potato masher, mash them to combine everything but avoid mashing up the cheese too much.