In a large bowl combine chicken, blueberries, celery, and shallots.
In a medium bowl whisk together yogurt, basil, mint, mustard, honey, lemon zest and juice. Season with salt and pepper.
Gently toss dressing in large bowl with chicken mixture until well coated. Season with additional salt and pepper, to taste. Sprinkle with pistachios and serve on a bed of lettuce or in lettuce wraps.