Prep the dressing: In a large bowl, whisk together Greek yogurt, mayonnaise, Dijon, lemon juice, honey, and garlic powder. Season with a good pinch of salt and pepper. Taste and adjust—add a little more lemon for brightness or a touch more honey for balance.
Toast the nuts: In a dry skillet over medium heat, toast pecans or almonds for 3–4 minutes, stirring often, until fragrant.
Let them cool so they stay crunchy in the salad.
Combine the base: Add chicken, grapes, celery, red onion, and parsley to the bowl with the dressing. If using dried cranberries or apple, add them now.
Fold gently: Use a spatula to fold everything together until well coated. Avoid smashing the grapes.
Add crunch last: Stir in the cooled nuts just before serving to keep them crisp.
Adjust seasoning: Taste and add more salt, pepper, or lemon as needed.
The flavors should be bright and balanced, with a light sweetness from the grapes.
Chill (optional but recommended): Cover and refrigerate for 30–60 minutes to let the flavors meld.
Serve your way: Spoon into lettuce cups, pile on whole-grain toast, tuck into a wrap, or serve over mixed greens.