Creating Chicken and Spinach Casserole with Cream Cheese is simple when you follow these steps:

1. Preheat the Oven: Set your oven to 350°F (175°C) and grease a 9×13 inch baking dish.
2. Prepare Chicken: In a mixing bowl, combine the shredded chicken with the softened cream cheese, sour cream, garlic powder, onion powder, salt, and black pepper. Mix well until smooth and creamy.
3. Add Spinach: Gently fold in the fresh baby spinach into the chicken mixture until blended thoroughly.
4. Layer the Casserole: Pour the chicken and spinach mixture into the greased baking dish, spreading it evenly.
5. Add Cheese Topping: Sprinkle the shredded cheddar cheese evenly over the top of the casserole.
6. Prepare Breadcrumbs: In a separate bowl, mix the breadcrumbs with a tablespoon of olive oil or melted butter. Stir until the crumbs are coated.
7. Top with Breadcrumbs: Spread the breadcrumbs evenly over the casserole. If desired, sprinkle grated Parmesan cheese on top for extra flavor.
8. Bake: Place the casserole in the preheated oven and bake for 30 to 35 minutes or until bubbly and golden brown on top.
9. Cool and Serve: Allow the casserole to cool for about 5 minutes before serving. This helps it set slightly for easier slicing.

These clear instructions will ensure that your Chicken and Spinach Casserole is not only easy to make but also results in an incredible dish full of flavor.