Dice the red onion, cucumber, avocado, and celery. Remove fresh dill leaves from their stalks and chop finely. Prepare chicken.
In a mixing bowl, add Greek yogurt, mayonnaise, Dijon mustard, lemon juice, dill, sriracha, and pickle juice. Whisk everything together.
Add your diced produce into the mixture. Fold everything together.
Then, stir in cooked and shredded chicken and dried cranberries. Mix well.
Top with salt and pepper and serve on a bed of greens, fresh rolls, or with crackers.