This is the best potato soup I have ever had.
Whole milk forms the foundation of this soup, demanding constant attention at a gentle simmer to prevent milk solids from scorching against the bottom of a heavy stockpot. Starch granules in flour require thorough cooking in melted butter before hitting the liquid; whisking this hot roux into bubbling milk prevents pasty clumps and thickens the base reliably. Baking the potatoes ahead of time concentrates their natural starches by driving off excess moisture, yielding a fluffy interior that breaks down smoothly into the broth rather than turning gluey. Dry chicken seasoning introduces concentrated sodium and savory depth without thinning the thickened dairy base. Placing assembled bowls under a high broiler for ninety seconds melts shredded cheese rapidly without overcooking the soup underneath. Crisp bacon lardons and cold sour cream provide necessary contrast in temperature and texture against the piping-hot dairy. Pair this rich dish with a sharp, vinegar-dressed green salad to cut through the high fat content.