Brown the butter: Melt 1 stick of butter in a saucepan over medium heat, stirring frequently. Once it starts to foam, keep stirring until the butter milk solids turn golden brown on the bottom of the pan and has a nutty aroma and nutty flavor. Remove from heat immediately and let it cool for a few minutes. This works best with a silver or light-colored pan, so you can see the milk solids' color while the butter melts in the browning process.
In a large bowl, add the light brown sugar and white sugar until well combined. Pour the browned butter in and whisk together until emulsified. Allow to cool for around 5 minutes.
Add the egg and vanilla bean paste, mixing until well combined. (Be sure the sugars aren't too hot to prevent the egg from cooking while mixing)
In a separate bowl, whisk together the flour, baking soda, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing with a rubber spatula just until just combined. I recommend adding in 3 batches.
Stir in the chocolate chunks. (Again, make sure the dough is cooled enough, or else the chocolate will start to melt.)
Scoop the cookie dough balls onto the prepared baking sheet, spacing the cookies at least 2 inches apart. The dough should weigh roughly 34-40 grams per cookie, unless opting for slightly smaller cookies.
Place extra chocolate chunks on top of each ball of dough.
Chill the dough in the refrigerator for at least 30 minutes. (Don’t even think about skipping this step)
Meanwhile, pre-heat the oven to 375º Fahrenheit.
Bake cookies straight from the fridge for 9-12 minutes.
Remove the cookies and gently smack the sheet tray on your counter, this will help deflate the cookies a bit, creating crinkly edges and a chewier texture. Optionally, top finished cookies with flaky sea salt.
Cool & Enjoy :)