Poach chicken breasts in simmering water for 15 to 20 minutes until the internal temperature reaches 165 degrees Fahrenheit.
Remove chicken from liquid and shred into bite-sized pieces using two forks.
In a large mixing bowl, whisk together mayonnaise, sriracha, lime juice, garlic powder, salt, and black pepper until smooth.
Add the shredded chicken, diced celery, and minced red onion to the bowl.
Fold the ingredients together until the chicken is uniformly coated with the spicy dressing.
Stir in the chopped cilantro.
Refrigerate for at least 30 minutes to allow flavors to meld before serving.