Heat a waffle iron according to your manufacturer's instructions. Be sure to grease it well; again - according to the instructions. Mix the dry ingredients together with a whisk, stirring in the chocolate chips last. Add in the milk, then the slightly cooled melted butter. Add the eggs and stir, just enough to combine - there might be a few lumps in the batter; you just don't want any dry patches or big lumps. Pour the amount of batter specified for your waffle iron onto the preheated waffle iron and cook according to your instructions or until the steaming stops. For softer waffles, cook less time, for crispy waffles, cook longer. In general, if the steaming has dramatically slowed down and you can easily open the waffle iron to remove the waffle without it sticking, it is most likely done. Serve as is or with butter or powdered sugar or syrup - whatever you prefer.