Step 1: Prepare the Chicken: Ensure the cooked chicken is thoroughly cooled. Dice the chicken into bite-sized pieces, aiming for a uniform size to ensure even distribution within the salad.
Step 2: Combine Ingredients: In a large mixing bowl, gently combine the diced chicken, finely chopped celery, minced red onion, and chopped fresh parsley. If using, add the halved seedless grapes and chopped toasted pecans or walnuts.
Step 3: Dress the Salad: In a separate small bowl, whisk together the mayonnaise, fresh lemon juice, kosher salt, and freshly ground black pepper until smooth. Taste and adjust seasonings as needed, adding more salt, pepper, or lemon juice to taste.
Step 4: Incorporate the Dressing: Pour the dressing over the chicken mixture. Gently fold the ingredients together until the chicken and vegetables are evenly coated. Be careful not to overmix, as this can make the chicken salad mushy.
Step 5: Chill and Serve: Cover the bowl with plastic wrap and refrigerate for at least 30 minutes to allow the flavors to meld. For optimal flavor, chill for at least 1-2 hours. Before serving, give the chicken salad a gentle stir. Serve chilled on croissants, lettuce cups, or with crackers.
Optional: For a tangier flavor, add a teaspoon of Dijon mustard to the dressing. Substitute dried cranberries for grapes for a sweeter flavor profile. To enhance the nutty flavor, toast the pecans or walnuts in a dry skillet over medium heat for 3-5 minutes, or until fragrant.