I'm re-posting this recipe just in case you glazed over after reading directions that included a step to brown some butter. I have never seen this in a cookie recipe before but I must tell you . . . make these. The extra step was so worth it. This recipe is spectacular.
* 14 tablespoons unsalted butter
* 1/4 cup granulated sugar
* 2 cups packed dark brown sugar
* 2 cups flour
* 2 tablespoons flour
* 1/2 teaspoon baking soda
* 1/4 teaspoon baking powder
* 1/2 teaspoon salt
* 1 large egg
* 1 large egg yolk
* 1 tablespoon vanilla
1. Heat 10 Tbs butter in 10" skillet over med-high heat until melted, about 2 minutes. Continue to cook, swirling pan constantly until butter is dark golden brown and has nutty aroma, 1-3 minutes. Remove skillet from heat and transfer browned butter to large heatproof bowl. Stir remaining 4 Tbs butter into hot butter to melt; set aside for 15 minutes.
2. Meanwhile, adjust oven rack to middle position and heat oven to 350. Line 2 large (18x12") baking sheets with parchment paper. In shallow baking dish or pie plate, mix granulated sugar and 1/4 cup pack brown sugar, rubbing between fingers, until well combined; set aside. Whisk flour, baking soda and baking powder together in medium bowl; set aside.
3. Add remaining 1 3/4 cups brown sugar and salt to bowl with cooled butter; mix until no sugar lumps remain, about 30 seconds. Scrape down bowl. Add flour mixture and mix until just combined, about 1 minute. Give dough final stir with rubber spatula to ensure that no flour pockets remain and ingredients are evenly distributed.
4. Divide dough in 24 portions, each about 2 Tbs, rolling between hands into balls about 1 1/2" in diameter. Working in batches, toss balls in reserved sugar mixture to coat and set on prepared baking sheet, spacing them about 2" apart, 12 dough balls per sheet. (Smaller baking sheets can be used, but it will take 3 batches.)
5. Bake one sheet at a time until cookies are browned and still puffy and edges have begun to set but centers are still soft (cookies will look raw between the cracks and seem underdone), 12-14 minutes, rotating baking sheet halfway through baking. Do not overbake. See here for done test information.
6. Cool cookies on baking sheet 5 minutes; using wide metal spatula, transfer cookies to wire rack and cool to room temperature.