Preheat oven to 375°F and lightly grease a small baking dish.
In a mixing bowl, stir together cream cheese, sour cream, and mayonnaise until smooth.
Fold in spinach, artichokes, garlic, salt, pepper, mozzarella, and parmesan.
Spread mixture evenly into the prepared dish.
Bake uncovered for 20–25 minutes until hot and bubbly on top.