Preheat the oven to 350°F. Lightly grease a 1-qt baking dish.
Mix together the cream cheese, mayonnaise, Parmesan, Romano, garlic, basil, garlic salt, salt, and pepper. Gently stir in the artichoke hearts and spinach. Transfer the mixture to the prepared baking dish. Sprinkle the mozzarella on top.
Bake for 25 minutes, until bubbly and lightly browned on top. Transfer the dip to a bread bowl (if using) or serve warm with pita chips or small toast.
*Make and refrigerate this sensational, simple-to-prepare dip up to 24 hours ahead. Bake as directed.
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