When cooled slightly, whisk in the sugars, oil, egg, egg yolk, milk and vanilla until thoroughly blended. I like to whisk this for about 3 minutes or so. You want the mixture looks smooth and shiny.
Place a sieve over the bowl and sift in the flours, baking soda, baking powder and salt. Fold until barely mixed and then add the chocolate. Combine until the flour is gone and the chocolate is evenly dispersed.
Pour the mixture into the prepared baking dish. It will be a bit thick so do your best to spread it evenly across the baking pan. Cook for 25-35 minutes. At the 20-minute mark check for doneness. Once the time is up, remove it from the oven and let the brookies cool completely in the pan. You can sprinkle some sea salt on top or leave it be!
Cut the chocolate cookie bars into even squares and serve them with a cup of milk! :)
* If you do not have bread flour you can use all-purpose
** I did not have baking soda so I used 1 tsp total baking powder and it turned out fine. I am a student I barely have many ingredients! LOL