Skillet Chocolate Chip Cookies

Adjust oven rack to upper-middle position and preheat oven to 350°F.

Butter a 12-inch cast-iron skillet with 1 tablespoon of butter and also spray it with nonstick cooking spray. In a medium-sized bowl, whisk together the all-purpose flour and baking soda; set aside.

Melt 9 tablespoons of butter in a heavy-bottomed, medium-sized saucepan set over medium heat. Brown the butter, swirling continuously, until the butter has melted and is dark golden brown, about 3-5 minutes. Most of the bubbling will have subsided and the butter will have a nutty aroma. Watch very carefully the last minute – it can burn quickly. Transfer the melted butter to a large, heat-proof bowl and add the remaining 3 tablespoons butter; stir until melted.

Whisk

Add the sugars, salts, and vanilla; whisk until incorporated. Add egg and egg yolk and whisk until smooth, about 30 seconds. Let mixture stand 3 minutes. Repeat the process of whisking (30 seconds) and resting (3 minutes) for 3 times more times (a total of 4 times). Mixture will be thicker, smooth, and shiny.

Add the flour mixture and stir just until no flour is visible.

Stir

Add chocolate chips and stir just until incorporated.

Bake

Press the cookie dough evenly into the prepared skillet and transfer to the oven. Bake for 23-28 minutes (rotating after 13 minutes), or until middle has barely set.

Cool 5-10 minutes before slicing into wedges.