Preheat oven to 350 degrees F. Line baking sheets with parchment paper if not using Doughmakers Baking Sheets.
In a mixing bowl, whisk together flour, cocoa powder, baking powder and salt. Set aside.
Using a stand mixer with a paddle attachment or hand mixer, cream butter, dark brown sugar, and granulated sugar until light and fluffy.
Beat in the eggs, one at a time, ensuring each is fully incorporated before adding the next. Add the vanilla extract and mix well.
Gradually add the dry ingredients, mixing until just combined. Scrape down the sides of the bowl as you go along.
Stir in the chocolate chips, distributing them evenly throughout the dough.
Drop a large dough ball onto a food scale, measuring 5 oz. If you do not have a food scale, use 1/3 cup and fill it.
Roll dough into large balls. Drop 6 balls onto a baking sheet, making sure to leave room for spreading.
Press your hand down on the dough ball to flatten it down slightly.
Bake for 12-14 minutes, or until the edges are just set but the centers are still slightly soft.
Remove from the oven and let the cookies cool on the baking sheet for about 2-3 minutes, then transfer to a wire rack and cool completely. If the cookies are still too rounded, use the back of the spatula to slightly press them down while they are still on the cookie sheet.