In a saucepan, add the butter and melt down.

In a mixing bowl add the first cup of chocolate chips and pour the melted butter on top. Wait a minute, before mixing these together until the chocolate chips are melted and smooth.

Add in the sugars and mix again until combined.

Crack in the eggs and add the vanilla. Mix until incorporated.

Add all the dry ingredients at once of baking powder, flour, salt and cocoa powder. Fold this into the dry ingredients until a thick dough has formed.

Pour in the rest of the chocolate chips and fold into the dough. At this point it will be similar to the consistency of a regular brownie batter, but this will be chilled first.

Cover the bowl in plastic wrap and refrigerate for 30 minutes.

Preheat the oven to 350 degrees Fahrenheit and prepare a baking sheet with parchment paper.

Remove the chilled dough from the fridge and use a 2 inch scooper to scoop out balls of cookie dough. Place each on the baking sheet about 2 inches apart from each other, fitting about 8 per baking sheet.

Bake in the oven for 11-13 minutes or until the tops of the brownie cookies are crinkly and the edges are firm.

Let cool for at least 5 minutes and serve while warm!