Boil potatoes until tender. Peel potatoes and place in the bowl of an electric mixer.
Meanwhile, heat oil in a skillet.
Add sausage and scallions. (Reserve a little scallion for garnish). Saute until sausage starts to brown. Add cabbage and saute until cabbage is cooked, about 5 minutes. Add parsley and stir to combine.
Whip the potatoes with the butter, cream and milk until creamy. Add salt and pepper. Whip to combine.
Using a rubber spatula, fold the cabbage combination into the potatoes.