Preheat your oven to 400F. Coat a 9x13 baking dish with cooking spray.
Combine cooked and shredded chicken with all other ingredients EXCEPT for the shredded pepper jack cheese and the “for serving” ingredients in an extra large bowl then toss to combine.
Transfer contents of the bowl to the prepared baking dish then top with the shredded pepper jack. Bake in the oven for about 30-40 minutes or until the cheese is melted and golden.