Cut the unsalted butter into squares and place them into a heavy bottom, wide saucepan and melt it on medium heat.
Whisk the butter every 1-3 minutes. As it melts, the butter will foam up.
After about 5 minutes, you will begin to see the butter turning a darker yellow and less foam will be present. Continue ocassionally whisking.
You will smell a nutty, caramel aroma coming from the butter when it's done.
Once you see the butter solids starting to turn a golden brown color (not black) you can remove everything from the heat. Continue whisking a bit while it cools down so it doesn't burn from the residual heat.
You can strain the butter to remove the brown flecks or leave them in. Your browned butter is now ready to use!
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Notes
Use unsalted butter so your browned butter is not too salty.Start with room-temperature butter so it doesn't splatter or burn while it's melting.Use a high-quality, European-style butter for the best flavor.Brown your butter over medium to medium-low heat and whisk frequently to prevent burning.