I made this last week- it always goes down well with the kids. I found it was a bit of a timesaver too as I cooked the potatoes in the morning so I had less to prepare in the evening.
It’s just cooked new potatoes cut into quarters, red onion diced, snipped chives(from my herb pots!), mayonnaise and seasoning. Stir it all together. I had the leftovers in a salad for lunch the next day.