Preheat oven to 250 degrees Fahrenheit.
Thaw spinach in microwave and drain of excess water. In a large bowl, mix softened cream cheese and mozzarella cheese with spinach and minced artichokes. Add in garlic powder and freshly ground black pepper. Spread mixture evenly in small casserole dish. Sprinkle the top with Parmesan cheese.
Bake in oven for 30 minutes.