Spray the inside of a small baking dish with a non-stick cooking spray, or wipe with a vegetable oil.
In a mixing bowl, stir together cream cheese, sour cream, mayonnaise, garlic, Parmesan, mozzarella and pepper.
Stir in artichokes and spinach.
Spread mixture evenly into prepared baking dish.
When ready to serve, bake uncovered ~30 minutes.