Add the sugar(s) and eggs to a medium mixing bowl. Using an electric whisk, whisk on high for around 5mins until the mixture is pale in colour. Note: using an electric whisk delivers the best results as it breakdowns the sugar best and incorporate air the most effectively.
Add the chopped chocolate and butter to a medium bowl and microwave for 30-1min until the butter has melted. Remove and add the coffee. Mix until well combined and fully melted. Allow the mixture to cool down for 5 minutes. Once cooled, add to the whipped sugar-egg mixture. Whisk again, until well combined.
In a separate bowl, lightly mix, flour, cocoa, baking powder, and salt together. Add to the wet ingredients. Using a spatula, mix until well combined but resist overmixing.
Add the remaining chopped chocolate and mix but, again, resist overmixing. Pop the batter in the fridge for 30 minutes.
Meanwhile, preheat the oven to 180℃/356℉. Line a tray with baking paper.
Once the batter has chilled, scoop about 3 tablespoons worth of cookie batter, shape into a ball and place on the baking tray, about 3 inches apart. Bake in batches. Note: If you want the cookies chunkier, like min, then use 3 tbsps worth of cookie batter. If you want less chunkier and flatter cookies I'd recommend you use only 2 tbsp worth of batter.
Bake for 10-12 minutes. They'll start spreading out and forming a crackling top. The center must still be soft once removed from the oven. Allow to cooldown. Note: The longer they bake the less fudgey they'll be inside.