Preheat oven to 350F. Lightly grease a 9x13" baking dish.
In a mixing bowl, combine chicken, noodles, sour cream, soup and cheeses. Pour into prepared dish.
Mix together cracker crumbs and butter; sprinkle over top.
Bake for 25 to 30 minutes or until crackers are crispy and golden and cheese is melted.
