If you grew up in a farmhouse kitchen, you know that potato soup was often a canvas for whatever odds and ends were on hand. For a richer flavor, you can sauté the chopped onion in the butter first until it’s soft and golden, then add the potatoes and water. If you prefer a silkier soup, use an immersion blender to puree it right in the pot, or blend part of it and stir it back in so you keep a few tender chunks. When you have extra ingredients around, a handful of shredded cheddar cheese stirred in at the end turns this into a cheesy potato soup, and a few crisp bacon crumbles on top will make it feel like a Sunday treat. You can also swap part of the milk for chicken broth if you want a slightly lighter, more savory flavor. For those cooking ahead, the soup will thicken as it sits in the refrigerator; simply loosen it with a splash of milk when you reheat. And if you’re feeding someone who needs a little extra comfort, serve it in a favorite old bowl, the way my grandmother did—because sometimes the vessel and the memories are just as soothing as the soup itself.