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 teaspoon Kosher Salt, Or To Taste
• Freshly Ground Black Pepper
• Extra Cheese, For Sprinkling
• 1 pound Thin Spaghetti