The best way to do it well and repeatedly is to use the scraper beater that comes with this mixer. The scraper beater scrapes the butter from the sides while it mixes to beat it all at the same time. WARNING – this is about 3 times faster than using the metal beater so keep an eye on it the first time you do it. Make a note of how long it takes then next time, set the mixer’s timer and it will turn off when it’s done so you don’t over mix.