Prep the chicken: Chop or shred cooked chicken into bite-size pieces.
Aim for even pieces so the salad coats well.
Mix the dressing: In a large bowl, whisk non-fat Greek yogurt, lemon juice, Dijon, honey (if using), garlic powder, salt, and pepper. Taste and adjust acidity or sweetness.
Add the crunch: Stir in celery, onion, and herbs. Fold until evenly distributed.
Combine: Add chicken and grapes.
Toss gently to coat without smashing the fruit.
Finish with nuts: Fold in toasted almonds or walnuts, if using. Add more salt, pepper, or lemon to taste.
Chill (optional): Cover and refrigerate for 20–30 minutes to let flavors meld.
Serve: Spoon into lettuce cups, pile onto whole-grain toast, roll in a wrap, or serve over greens. Add extra herbs on top for freshness.