Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking dish with butter.
Mix cooked chicken, sour cream, onion, cream of chicken soup, and milk in a large bowl; pour into the prepared baking dish.
Bake in the preheated oven until hot, about 15 minutes.
Stir 1/2 cup Cheddar cheese into the mixture and arrange unbaked biscuits over top of casserole. Sprinkle remaining 1/2 cup Cheddar cheese over biscuits.
Return to oven and bake until biscuits are done in the middle and the chicken mixture is bubbling, 25 to 30 more minutes.
Nutritional Facts
Per 8 servings
Calories: 437
Carbohydrate: 21g
Fat: 28g
Fiber: 0g
Protein: 26g
Sugar: 4g
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