Combine cream cheese, mozzarella, and Parmesan with 1/2 teaspoon garlic. Spoon evenly into bottom of a cooking spray coated 10 inch pie plate. Combine artichoke hearts and 2 teaspoons garlic. Spread over cheese mixture.
Whisk together milk, mayonnaise, sour cream, egg, and egg whites. Whisk in baking mix. Spoon batter overtop of artichoke mixture and bake 35 to 40 minutes. Let rest 5 minutes before serving.