Grab a medium bowl and dump in the chopped chicken. Break up any big pieces so every bite is a party.
Add mayo (or yogurt). Give it a good stir until the chicken looks creamy but not drowned. You want coating, not a sauce flood.
Stir in lemon juice, celery, red onion, and herbs. The crunch and brightness are what make this sing.
Season with salt and pepper. Taste, then adjust. You’re aiming for bold without being bossy.
If you’re adding extras (apple, grapes, nuts), fold them in now. They’re the surprise texture that people will remember.
Chill for at least 15 minutes if you can. The flavors need a tiny spa day to mingle properly.