Prep the aromatics: Finely dice the celery and red onion.
Chop the herbs. Keep the pieces small so every bite is balanced and easy to eat.
Drain the chicken very well: Open the cans and press the lid against the chicken to squeeze out excess liquid. Transfer the chicken to a bowl and use a fork to break it into small shreds.
Make the dressing: In a separate small bowl, stir together mayonnaise, Greek yogurt (if using), Dijon, lemon juice, and relish.
Start with the lower amounts; you can always add more.
Combine gently: Add celery, onion, and herbs to the chicken. Spoon the dressing over the top and fold everything together until coated. Don’t mash it—keep some texture.
Season: Sprinkle in salt and black pepper.
Taste and adjust. Add more lemon for brightness, more mayo for creaminess, or more Dijon for a sharper bite.
Customize: If you like a touch of sweetness and crunch, fold in diced apple or halved grapes. For nuttiness, add a handful of toasted almonds or walnuts.
A pinch of paprika or celery seed adds classic deli flavor.
Chill (optional but better): Cover and refrigerate for 20–30 minutes. This helps the flavors meld and firms up the texture.
Serve: Pile onto toasted bread or a flaky croissant, scoop with crackers, or spoon onto a bed of greens. For a lighter option, serve in crisp lettuce cups.