Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the softened cream cheese, sour cream, garlic powder, onion powder, salt, black pepper, and paprika. Mix until smooth and well combined.
Stir in the shredded chicken, chopped spinach, and cooked rice (if using) until everything is evenly coated with the cream cheese mixture.
Transfer the mixture to a greased 9x13 inch baking dish, spreading it out evenly.
Sprinkle the shredded mozzarella cheese and grated Parmesan cheese evenly over the top.
Bake in the preheated oven for 25-30 minutes, or until the cheese is melted and bubbly.
Remove from the oven and let it cool for 5 minutes before serving.