• Step 1: In a large bowl, combine the shredded cooked chicken, diced celery, diced onion, and diced bell pepper. Gently mix to combine.
• Step 2: In a small bowl, whisk together the mayonnaise, Dijon mustard, lemon juice, salt, and black pepper until well blended.
• Step 3: Pour the dressing over the chicken and vegetable mixture, and stir until everything is evenly coated.
• Step 4: Gently fold in the halved grapes, taking care not to crush them.
• Step 5: Cover the bowl and refrigerate the shredded chicken salad for at least 30 minutes to allow the flavors to meld.