MAKE THE GRAVY In a small saucepan ... add the warm milk and mix until blended. Stir in the sour cream, Parmigiano, mustard, cayenne and chives and season with salt and pepper.
Pat dry on kitchen paper and chop. Mix in with the scallions, sour cream and cheese. Place the hot potatoes into a serving dish. Spoon over some gravy and top with the bacon cheese mixture.
Inspired by the Canadian dish poutine from Quebec, this easy version is topped with mozzarella and gravy and is the ultimate ... giving them one little mix so they get coated in the hot oil ...