Pre heat your oven to 177°C/350°F.
Combine the flour, cocoa powder, baking powder, and salt. Sift and set aside.
In a stand mixer, combine the butter & brown sugar. Mix on low speed with the paddle attachment to combine.
Switch to medium speed and cream until light in color. About 4 minutes. Scrape down the bowl and paddle halfway through.
Add in the eggs and vanilla on low speed. Mix until combined.
Add in the sifted dry ingredients and mix until just combined. No dry spots. Do not overmix.
Scrape the bowl and paddle. Mix and fold the dough gently with a rubber spatula, especially at the bottom, to ensure an even mix.
Scoop the dough and toss it entirely in powdered sugar. Place on a parchment-lined sheet tray. Space cookies at least 3 inches apart.
Dust the top of each cookie with a thin layer of crimson red cocoa powder.
Bake for about 8-10 minutes. The edges should be set and the center soft.