Line baking sheet with parchment paper or silicone baking mat. Set aside.
Preheat oven to 375 degrees F.
In a large mixing bowl of a stand mixer, beat butter for 30 second. Add brown sugar and cream until fluffy.
Add baking powder and salt and mix well.
Add eggs, one at a time, and vanilla. Beat well.
Lower the speed of your mixer and add as much flour as you can. Stir the rest in.
Stir in chocolate chips.
Transfer the dough onto the floured surface.
Shape into a log and divide into two portions.
Slice each log into about 12 pieces. The dough will be sticky so you may need to wipe the knife between slices. With floured hands, transfer the slices onto prepared baking sheet.
Bake 15 to 18 minutes, or until golden brown and hard to the touch.
Cool on sheet for 2 minutes, then transfer onto a cooling rack to cool completely.