First, brown butter. Add butter to a skillet over low medium heat. Continue stirring for about 5 to 7 minutes, until butter has turned a golden color.
Then, pour butter into a bowl. Scrape the brown bits at the bottom of the skillet into the bowl. Place bowl in freezer while you gather the other ingredients. Line baking pan with parchment paper.
In a large bowl, combine flour, baking soda and sea salt. Set aside.
Remove brown butter from freezer. In a mixing bowl, add brown butter, granulated sugar and brown sugar. Stir to combine.
Then, add in vanilla extract and eggs. Stir to combine.
Pour wet mixture into the dry mixture. Stir to combine.
Fold in chocolate chips and chocolate chunks. I recommend using both if possible.
Use ice cream scoop to scoop balls of dough onto lined baking pan. Then, chill these balls of dough for 1 hour in fridge.
After 1 hour, remove pan from fridge. Preheat oven to 375 degrees Fahrenheit. Bake cookies for 8 to 9 minutes or until edges are just barely golden.
Finally, remove cookies from oven. Allow them to cool on pan for 5 to 10 minutes before gently transferring to a cooling rack.
