Cook the Chicken: If using raw chicken, cook it by boiling, roasting, or grilling until fully cooked. Shred or chop it into bite-sized pieces.
Prepare the Vegetables: Chop the celery, onion, and carrots into small, bite-sized pieces.
Make the Dressing: In a small bowl, mix mayonnaise (or Greek yogurt), mustard, honey, vinegar, and a pinch of salt and pepper. Adjust the seasoning to taste.
Combine Ingredients: In a large mixing bowl, combine the cooked chicken, chopped vegetables, and any optional ingredients like grapes or nuts.
Add the Dressing: Pour the dressing over the chicken and vegetable mixture, stirring gently to coat everything evenly.
Chill and Serve: Refrigerate the salad for at least 1 hour before serving, allowing the flavors to meld together. Serve on a bed of lettuce, in a sandwich, or with crackers.