Cut the sticks of butter into small, equal-sized pieces. Allow the butter to sit out at room temperature for 20-30 minutes before beginning so that it's not too cold. Place a saucepan over medium heat on the stovetop. Add the chunks of butter to the saucepan, and stir to melt.
Once melted, the butter will get really foamy and sizzle around the edges. Keep stirring. After a few moments, the butter will stop making so much noise, and the milk solids will begin to separate. Keep moving the butter around to help the milk solids toast evenly.
Keep a very close eye on it now, the butter will continue to bubble up, and you will want to keep it moving. It will brown and become a nice golden brown color very quickly. When the butter is a nice golden amber color, you'll notice little brown bits at the bottom of the pan, and a nice nutty smell. This usually takes about 5-10 minutes depending on the amount of butter you're using. DO NOT walk away from the stovetop! This process goes quick, and your butter can go from browned to burnt and bitter very quickly!
Once the butter has plenty of brown flecks on the bottom of the saucepan, remove it from the heat immediately and place it in a heatproof bowl or container. The residual heat will continue to cook it gradually even off the heat.
Now, weigh the remaining butter using a food scale. You can anticipate to lose about 20-25% of the total volume of the butter after cooking. This is because the water content will evaporate while the butter cooks. You can drop in a little bit of extra butter at the end and stir to melt, or, you can always brown about 25% more butter than you'll actually need for whatever recipe you're using to end up with the correct amount.
If you end up with too much, don't worry! Brown butter stores really well for long periods of time in the fridge and freezer. Your browned butter is ready to use! Enjoy it in a variety of dishes and baked goods!
Store leftover brown butter in the fridge in an airtight container for up to 2 months. It can be kept easily in the freezer for up to 6 months.