Brown the butter. Place butter in a saucepan or skillet over medium-low heat and cook until melted. Once melted, increase heat to medium and cook, stirring constantly.
Butter will sizzle and pop,. Once the sizzling and popping slows and brown flecks form, remove the butter from heat and pour into a large heatproof mixing bowl. Allow to cool completely.
Transfer to center rack of 350F oven and bake for 10-12 minutes, cookies should be beginning to turn light golden brown. Allow cookies to cool completely on baking sheet. Enjoy!