Pour in the whole milk and return the pot to low heat. Stir gently, breaking up some of the potatoes with the back of a spoon while leaving plenty of chunks for texture. Do not let the soup boil; just warm it through until it’s steaming and lightly thickened, 5–8 minutes.
Taste and adjust the seasoning with additional salt and black pepper. If the soup seems too thick, add a splash more milk; if it’s too thin, let it simmer on low a few more minutes, stirring often, until it reaches a creamy, spoon-coating consistency.
Ladle the hot potato soup into chipped mugs or bowls. Top each serving with an extra small pat of butter so it melts into the creamy surface, and serve immediately while steaming.
Variations & Tips
For a slightly richer soup, replace 1 cup of the milk with half-and-half, keeping the heat low so it doesn’t curdle. If you like a smoother texture, mash more of the potatoes in the pot or use an immersion blender briefly, leaving a few chunks for that old fashioned feel. To stretch the soup further without adding more ingredients, serve it over a scoop of plain cooked rice or leftover mashed potatoes. If you’re not strictly holding to the 4-ingredient spirit, you can add a bay leaf while simmering the potatoes for a subtle herbal note, or stir in a small handful of shredded cheddar at the end for a cheesy version. A sprinkle of chopped fresh parsley or sliced green onions on top adds color and freshness when you have them on hand, but the soup is designed to be satisfying even without any extras.
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