Creating this amazing Spinach Artichoke Casserole is easy with these clear steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Prepare the Spinach: Thaw the frozen chopped spinach and drain it thoroughly. Press it to remove excess moisture.
3. Mix the Base: In a large mixing bowl, combine softened cream cheese, sour cream, garlic powder, onion powder, salt, and pepper.
4. Add Vegetables: Add in the chopped artichoke hearts and the drained spinach. Mix until well combined.
5. Cheese it Up: Fold in the shredded mozzarella cheese and half of the grated Parmesan cheese into the mixture.
6. Grease the Dish: Lightly grease a baking dish with cooking spray or a little olive oil.
7. Transfer Mixture: Pour the spinach artichoke mixture into the greased baking dish, spreading it evenly.
8. Prepare Topping: In a small bowl, mix the breadcrumbs with a tablespoon of olive oil and the leftover Parmesan cheese. Sprinkle this topping evenly over the casserole.
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 Slightly: Once out of the oven, let it cool for a few minutes before serving to allow the textures to set.

These simple steps will guide you in crafting a perfect Spinach Artichoke Casserole that is sure to impress!