Heat a 10-inch nonstick skillet over medium-low heat and add 2 tablespoons of the butter. Allow the butter to sizzle and become foamy, swirling the skillet to avoid burning. When you see the butter solids turn golden brown, swirl the skillet again. Keep the heat on medium-low and don’t walk away. Stir or swirl often to prevent hot spots from browning the butter unevenly. Browning the butter on medium-low heat will take 4 to 5 minutes. The foam will begin to lessen and the color will become deeper brown when it is ready.