Pre-heat the oven to 365℉/170℃. Line two large baking sheets.
In a large bowl/the bowl of a stand mixer, combine the white sugar, brown sugar and eggs. Whisk on high until light and fluffy (about 3 minutes)
In a saucepan, melt the butter then (on a low heat) add the chocolate and coffee powder. Stir until all melted and combined.
Pour this chocolate/coffee/butter mixture into the egg/sugar mixture. Whisk to combine.
Add the vanilla and mix again. Fold in the flour, baking powder and cocoa powder.
Place tablespoon sized scoops of batter onto the lined pans, at least 2 inches apart (I do 6 cookies per large sheet).
Bake for 10-11 minutes, until the tops look shiny and crinkly. Remove and let cool (don't try to move onto a wire rack until they've set/cooled somewhat, or they will fall apart).
Repeat until all batter has been used!