Cut the celery, apple and onion into small cubes.
In a bowl, combine diced chicken, cranberries, almonds, apple, celery and onion.
Make the dressing: In a bowl, mix the yogurt with lime juice, salt and pepper to taste. Then pour the resulting sauce over the salad.
Cut the croissant in half lengthwise with a bread knife, place a lettuce leaf inside and fill with the prepared salad.