Creamy Chicken Spaghetti Casserole

Name: Creamy Chicken Spaghetti Casserole
Ingredients: 1 whole Cut Up Fryer Chicken; 1 stick 1/2 Cup Butter; 16 ounces weight White Mushrooms, Sliced; 1/4 cup Dry White Wine; Kosher Salt And Pepper; 1/4 cup Flour; 2 cups Chicken Broth (reserved From Chicken Or Canned); 1 1/2 cup Whole Milk; 1/4 cup additional Dry White Wine; 1 cup Freshly Grated Parmesan Cheese; 1 cup Whole Black Olives, Chopped; 1 tsp Kosher Salt, Or To Taste; Freshly Ground Black Pepper; Extra Cheese, For Sprinkling; 1 lb Thin Spaghetti