Combine chicken, corn, olives, raisins, carrots, celery, and apple in a large bowl.
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Step 2
Stir together cream and mustard in a cup and season with sugar, salt, and pepper. Pour dressing over salad and mix to combine. Season with salt and pepper and sprinkle with parsley.
Step 3
Arrange lettuce leaves and watercress on a platter and spoon salad in the middle. Sprinkle shoestring potato sticks on top and press into salad. Chill until serving.