Preheat oven to 350 degrees F (175 degrees C). Lightly grease a small baking dish.
In a medium bowl, mix together cream cheese, mayonnaise, Parmesan cheese, Romano cheese, 1/4 cup mozzarella cheese, garlic, basil, garlic salt, salt and pepper. Gently stir in artichoke hearts and spinach.
Transfer the mixture to the prepared baking dish. Top with remaining 1/4 cup mozzarella cheese. Bake in the preheated oven 25 minutes, until bubbly and lightly browned.
Servings 12
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.