Prepare Ingredients: If not already cooked, cook the chicken breast in a medium skillet until fully cooked. Let it cool, then shred.
Mix Dressing: In a large mixing bowl, combine mayonnaise, Greek yogurt, and Dijon mustard. Mix well.
Combine Ingredients: Add the shredded chicken, celery, red onion, grapes, and sliced almonds to the bowl. Stir until everything is thoroughly mixed with the dressing.
Season: Add salt and pepper to taste. Sprinkle with fresh parsley.
Serve: Serve the chicken salad on a bed of lettuce, in a sandwich, or with crackers.
Enjoy your yummy chicken salad!