Prepare the Chicken:
Cook or shred your chicken. Rotisserie chicken works perfectly for convenience.
Mix the Dressing:
In a large bowl, whisk together mayonnaise, Greek yogurt, Dijon mustard, lemon juice, salt, and pepper.
Add Mix-Ins:
Stir in celery, red onion, cranberries, and grapes (if using). Add chopped nuts for extra crunch.
Combine Everything:
Add the chicken to the bowl and mix until all ingredients are evenly coated with the creamy dressing.
Chill & Serve:
Cover and refrigerate for at least 30 minutes before serving to allow flavors to meld.