Creating this Creamy Chicken and Spinach Casserole is simple if you follow these easy steps:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C).
2. Prepare the Chicken: If you haven’t done so, cook and shred your chicken. You can use rotisserie chicken for convenience.
3. Sauté Spinach: In a large skillet over medium heat, add the chopped spinach. Cook for 2-3 minutes until wilted. Remove from heat and set aside.
4. Mix Ingredients: In a large bowl, combine the shredded chicken, sautéed spinach, cream of mushroom soup, sour cream, cooked rice, garlic powder, onion powder, salt, and black pepper. Mix well until everything is evenly coated.
5. Transfer to Baking Dish: Pour the mixture into a greased 9×13-inch baking dish, spreading it evenly.
6. Add Cheese: Sprinkle the shredded cheddar cheese over the top of the casserole.
7. Top with Parmesan: Finish by sprinkling the grated Parmesan cheese on top for added flavor and a golden crust.
8. Bake: Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the casserole is bubbly and the cheese is golden brown.
9. Garnish: Once baked, remove from the oven and let it cool for a few minutes. Garnish with chopped parsley before serving.

These steps will guide you to create a delicious and satisfying Creamy Chicken and Spinach Casserole that will surely become a favorite in your home.