We like to have it with salad and toasted sourdough bread.
Substituting heavy cream for the whole milk shifts this soup from a brothy consistency to a velvet-smooth emulsion, though it dramatically increases the saturated fat load. Russet potatoes, prized historically in American hearth cooking for their high amylose and amylopectin starch content, break down partially during boiling to naturally thicken the surrounding liquid.
Historically, thick potato potages evolved from nineteenth-century rural American adaptations of European dairy-based soups, utilizing abundant cellar potatoes and hard cheeses that required preservation. Early iterations relied entirely on the starchy cooking water combined with rendered pork fat or scraps of cured ham to build body before commercial bouillon cubes and standardized flour thickening agents became pantry staples.
Achieving the correct final consistency requires whisking all-purpose flour thoroughly into cold milk prior to introduction, preventing the formation of stubborn lumps that occur when raw flour hits hot liquids directly. Simmering the mixture over medium heat for precisely three minutes activates the starch granules fully, removing any raw flour taste without scorching the dairy sugars.
Shredding mild cheddar cheese manually on a box grater yields superior melting compared to pre-bagged varieties, which are coated in cellulose powder that inhibits smooth integration. Stirring the cheese in off the heat or over a very low flame prevents the milk proteins from separating into an oily, grainy matrix that ruins the velvety mouthfeel.