Creating Creamy Chicken and Spinach Casserole is a straightforward process. Just follow these steps:

1. Preheat your oven to 350°F (175°C).
2. In a large pot, bring water to a boil and cook the pasta according to the package instructions until al dente. Drain and set aside.
3. In a large mixing bowl, combine the shredded chicken, chopped spinach, cream of chicken soup, sour cream, cheddar cheese, garlic powder, onion powder, salt, and black pepper. Stir well to combine.
4. Add the cooked pasta to the mixture and gently fold until everything is well combined.
5. Grease a 9×13-inch casserole dish with olive oil. Pour the chicken and spinach mixture into the dish, spreading it evenly.
6. Pour chicken broth over the top of the casserole for added moisture.
7. In a small bowl, mix the breadcrumbs with 1 tablespoon of olive oil. Sprinkle the breadcrumb mixture evenly over the casserole.
8. Bake in the preheated oven for 40-50 minutes, or until the casserole is bubbly and the top is golden brown.
9. Remove from the oven and let it cool for about 10 minutes before serving.
10. For a finishing touch, garnish with freshly chopped parsley.

This concise list of steps makes preparing this delicious casserole easy and enjoyable.