Preheat oven to 350°F (175°C) and grease a 9x13-inch casserole dish.
In a large pot, cook chicken with celery, salt, and pepper until tender. Shred and set aside.
In a bowl, mix cream of chicken soup, sour cream, celery salt, garlic powder, onion powder, salt, and pepper.
Stir in cooked rice and shredded chicken until well combined.
Spread the mixture evenly into the greased casserole dish.
In another bowl, mix crushed buttery crackers with melted butter and sprinkle over the top.
Bake for 30-35 minutes or until the top is golden brown and crispy.
Let it rest for 5 minutes before serving. Enjoy!