Talk about the ultimate in make ahead. Potato salad can be made hours in advance and kept in the fridge. The key to potato salad is to cook the potatoes properly – too soft is a disaster but too hard and they are just gross! What’s perfect? Mom says insert a knife and if the potato slides off it’s cooked. She always used the yolks from the hard boiled eggs in the dressing which give it a lovely yellow colour.
This is a very forgiving recipe – don’t have enough sour cream or yogurt, use more of what you do have. I find that sour cream or yogurt take the edge off the mayo but 100% mayo certainly works.