Preheat oven to 375 degrease. Spray a 9 by 12 baking dish.
Place thawed hashbrowns in a large bowl.
In a medium bowl, add cream of chicken, sour cream, onion, 1/4 cup of the butter, salt, and pepper, mixing well. gently add mixture into the hashbrowns, add cheese and spread into baking dish, spread crackers evenly over top, pour remaining butter over crushed crackers.
Bake for 45 to 50 minutes until golden brown.(Cool before serving.)