Prepare the Chicken: If you don’t have pre-cooked chicken, season 2 large chicken breasts with salt and pepper. Cook in a preheated oven at 375°F (190°C) for 20-25 minutes or until fully cooked. Allow to cool, then shred or chop into bite-sized pieces.
Mix the Salad: In a large mixing bowl, combine the shredded chicken, celery, grapes, almonds, optional onion, and garlic. If you’re using fresh dill, add it to the bowl as well.
Prepare the Dressing: In a small bowl, mix together the mayonnaise and Dijon mustard until smooth. To taste, add salt and pepper for seasoning.
Combine: Pour the dressing over the chicken mixture and gently stir until all ingredients are well coated. Adjust seasoning if necessary.
Chill: For the best flavor, cover and refrigerate the chicken salad for at least 1 hour before serving. This enables the tastes to combine.
Serve: Serve the chicken salad on a bed of lettuce leaves or mixed greens for a complete meal. It can also be used as a sandwich or wrap filler.