I make mine the way I make chicken salad or tuna salad: mayo, scallions, and celery. Well, I chop the scallions and celery finer for egg salad.
BBQ potato chips go great with egg salad sandwiches
I recently started to experiment on egg salad because I wanted much less mayo. Here is a recipe that I find really good.
6 Hard-cooked Eggs
1 teaspoon of mayo
1-2 teaspoons of Dijon mustard
Pinch of cider vinegar, sugar, lemon juice, and pepper (and sometimes a dash of cayenne)
Chives
Mix all but the eggs together. Chop the eggs and work most of the yellow in to the mixture before folding in the whites.
I like it with grainy bread and arugula.