Browning butter is really pretty simple, you melt your butter in a skillet, and then keep heating it, swirling or stirring the butter almost constantly, until you start to see it brown. You’ll see little specks of brown appear, which are the milk solids in the butter. You can stop heating when it turns golden brown, or keep heating until it reaches a deep nutty brown, but you need to be careful not to let it burn or, of course, it becomes bitter.