Creating a Chicken Salad Sandwich is a breeze if you follow these simple steps:

1. Prepare Chicken: If you haven’t already, cook the chicken. You can boil, bake, or grill it until fully cooked, then shred it into bite-sized pieces.
2. Mix Ingredients: In a large bowl, combine the shredded chicken, chopped celery, and halved grapes (if using).
3. Prepare Dressing: In a separate small bowl, whisk together the mayonnaise, Dijon mustard, lemon juice, salt, and pepper until smooth.
4. Combine: Pour the dressing over the chicken mixture and stir until everything is well coated.
5. Taste and Adjust: Sample the chicken salad and adjust seasoning if necessary. You may want to add more salt or pepper.
6. Assemble Sandwiches: Take a slice of bread and add a generous amount of the chicken salad on top. Place leafy greens over the chicken salad and top with another slice of bread.
7. Slice and Serve: Cut the sandwich in half diagonally and serve immediately or store in the fridge for later.

These steps will lead you to a mouthwatering Chicken Salad Sandwich that is both satisfying and refreshing!