Mix ingredients (artichokes, spinach, cream cheese, mozzarella cheese, Parmesan cheese, garlic, milk, salt, and pepper) in a medium-sized mixing bowl.
14 oz. artichoke hearts, 8 oz. cream cheese, ¾ cup mozzarella cheese, ½ cup Parmesan cheese, ½ teaspoon minced garlic, ¼ cup milk, salt and pepper