How to Get Box Cake to Taste Homemade In just a few easy steps you can make your box cake recipes taste homemade! Read your instructions and add one more egg, two if you want it more rich. For the next step you use melted butter instead of oil and twice as much. Ditch the water and use milk! Finally mix and bake, it really is a huge difference that youll be able to tell by the first bite. YUM!