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In large mixing bowl, combine chicken, onion, celery, bell pepper and tomatoes. Season with salt and pepper to taste.
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In small bowl, combine mayonnaise, sour cream, lime juice, chipotle and garlic. Pour over chicken mixture; toss to combine.
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Arrange two lettuce leaves on each of 4 serving plates. Divide crumbled toasts onto lettuce leaves. Spoon chicken salad over crumbs; sprinkle bacon over each salad.