Chicken Salad Sandwich

Name: Chicken Salad Sandwich
Prep time: 10 min
Total time: 10 min
Yield: 2
Ingredients: Ingredients; Chicken Salad; 2 cups cooked chicken, shredded or diced (rotisserie chicken works well); 1/4 cup mayonnaise; 1 tablespoon Dijon mustard (optional); 1 tablespoon lemon juice; 2 tablespoons finely diced celery; 1 tablespoon finely diced red onion or green onions; 1 tablespoon chopped fresh parsley or dill (optional); Salt and pepper, to taste; Sandwich; 4 slices of bread (whole wheat, white, or your choice); Lettuce leaves; Tomato slices (optional); 1 tablespoon butter (optional, for toasting bread)