Start by preparing the chicken. If you’re using leftover chicken breasts or rotisserie chicken, shred the meat into small bite-size pieces using two forks. Place the shredded chicken into a large mixing bowl as the base of the salad.

Add the fresh ingredients to the bowl. Stir in the halved grapes, diced celery, and finely chopped red onion. These ingredients provide sweetness and crunch, which are essential for creating the classic texture of this salad.

In a separate bowl, prepare the dressing. Combine mayonnaise, Greek yogurt, lemon juice, Dijon mustard, garlic powder, salt, and black pepper. Whisk the mixture until it becomes smooth and creamy.

Pour the dressing over the chicken mixture and gently fold everything together until evenly coated. If using walnuts or pecans, mix them in at the end for added crunch. Chill the salad for at least 20 minutes before serving to allow the flavors to blend.