Preheat your oven to 350F/180C. Line two baking sheets with parchment paper or silicone mat.

Melt the chocolate and butter in a large heatproof bowl, placed over a saucepan of simmering water or in a microwave in 30 second intervals. Set aside to cool slightly. Stir the cocoa powder into the melted chocolate.

In a bowl of a stand mixer or a bowl using a hand mixer beat the sugars , eggs and vanilla for 4-5 mins until light and fluffy.

Beat the chocolate mixture into the egg mixture. Beat in the flour, salt, instant coffee and baking powder until just mixed. Stir in both the chopped chocolate.

Using a large cookie scoop, roll out as many cookie balls out of the dough as possible and place them on a cookie sheet 2 inches apart. Place a few chocolate chunks on top of the cookie balls.

Bake for about 12-13 mins. Let the cookies cool on the baking sheet for 15-20 mins before removing.