Making Creamy Chicken Divan Dinner is straightforward when you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare the Broccoli: If using fresh broccoli, steam the florets until bright green and slightly tender. If using frozen, thaw and drain excess water.
3. Mix the Sauce: In a large bowl, combine the cream of chicken soup, sour cream, garlic powder, onion powder, salt, and black pepper. Stir until well blended.
4. Combine Ingredients: Add the shredded chicken and broccoli to the sauce mixture. Stir gently to coat everything evenly.
5. Transfer to Casserole Dish: Pour the chicken and broccoli mixture into a greased 9×13 inch casserole dish, spreading it evenly.
6. Add Cheese: Sprinkle the shredded cheddar cheese evenly over the top of the chicken and broccoli mixture.
7. Prepare Breadcrumb Topping: In a small bowl, mix the breadcrumbs with melted butter until well coated. If desired, add grated Parmesan cheese for extra flavor.
8. Top the Casserole: Evenly sprinkle the breadcrumb mixture over the cheese layer in the casserole dish.
9. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes or until bubbly and golden brown on top.
10. Cool and Serve: Once baked, remove from the oven and let it cool for 5-10 minutes before serving.

These steps will guide you in creating this incredible dish effortlessly, ensuring a delightful dining experience.