When it comes to making waffles, there is one cardinal rule: do not overmix! Overmixing will result in tough, rubbery waffles that no one will want to eat. So, when you're getting ready to make waffles, be sure to preheat your waffle iron and spray it with cooking spray. Then, mix your batter just until all of the ingredients are combined. That's it! Now all you have to do is pour the batter into the iron and wait for deliciousness.