Creating the easy chicken salad sandwich is a breeze. Follow these straightforward steps:

1. Prepare Chicken: If using leftover or rotisserie chicken, shred or dice it into bite-sized pieces.
2. Chop Veggies: Finely chop the celery and grapes. If using fresh herbs, chop the parsley as well.
3. Mix Ingredients: In a large mixing bowl, combine the chicken, celery, grapes, mayonnaise, Dijon mustard, and parsley. Stir until everything is well-coated.
4. Season: Add salt and pepper to taste. Mix again to ensure even seasoning.
5. Chill: For the best flavor, cover the bowl with plastic wrap and refrigerate the chicken salad for at least 30 minutes. This step is optional but highly recommended.
6. Prepare Bread or Wraps: While the chicken salad chills, prepare your slices of bread or lettuce wraps. Make sure they are fresh and ready for filling.
7. Assemble Sandwiches: Place a generous scoop of the chicken salad on the bread or in the lettuce wraps. Top with leafy greens if desired, and cover with another slice of bread or fold the wrap.
8. Slice and Serve: Cut each sandwich in half and serve immediately or refrigerate if making ahead for later.

These steps will guide you in creating the easy chicken salad sandwich without any fuss.