Place chicken in a large saucepan and pour in enough water to cover it; set pan over high heat and bring to a boil. Boil until chicken is cooked through, about 10 minutes; drain. When chicken is cool enough to handle, cut into 1-inch cubes.
Transfer chicken to a large bowl and add celery, pickles, mayonnaise, sour cream, parsley, mustard, lemon juice, salt and pepper; mix until blended. Yields about 1 cup per serving.
For a Waldorf-like chicken salad, stir in 1/3 cup of diced apples and 2 tablespoons of chopped walnuts (for a total points value of 5 per serving).