Using a butter and flour mixture is a quick and easy way to prepare cake pans, forms, and molds in any recipe that directs you to grease and flour the pan. Rather than applying the two separately, you brush on the flour at the same time you grease the pan. This method can save a great deal of time when the task is done over and over throughout the day. Many establishments use the commercially produced pan sprays instead, and these work fine as well. Although today more equipment is being made from nonstick material, there will always be a need for this old-fashioned method.