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Ingredients:

4 boneless skinless chicken breasts, boiled and cubed
1 cup sour cream
1 (10 3/4 ounce) can cream of chicken soup (mushroom can be substituted)
25 Ritz crackers
1/2 cup butter, melted
salt and pepper

Directions:

1  Preheat oven to 350°F.
2  Boil chicken breast until tender; drain and cube.
3  Spread evenly over the bottom of a square casserole dish.
4  Salt and pepper to taste.
5  Mix sour cream and chicken soup in a separate bowl.
6  Spread the sour cream and soup mixture over the chicken in the casserole dish.
7  Crush the Ritz crackers and spread over top of the casserole.
8  Spoon melted butter on top over all.
9  Bake in a 350°F oven until top is golden brown, approximately 20-30 minutes.

source:     http://www.food.com/recipe/easy-creamy-sour-cream-chicken-casserole-108651