Preheat the oven to 325 degrees.
Line a 9X9 inch pan with parchment paper.
In the bowl of your mixer, add the eggs and sugar. Mix until smooth. (You can do this by hand as well)
Melt the butter in the microwave in 30 second increments until it has mostly melted. Then add 100 grams chocolate (cut into smaller pieces). Put the butter and chocolate back into the microwave for another 30 seconds. Then add the coffee and vanilla and stir until everything is incorporated. Allow the ingredients to cool down before adding it to the bowl. Blend on low speed until smooth.
Add the dry ingredients to the bowl. Blend on low speed until mostly incorporated. Finish mixing by hand with a spatula until the dry ingredients are completely incorporated.
Pour into the pan and spread evenly.
Top with chocolate chunks.
Sprinkle with Maldon salt.
Bake at 325 degrees for 30 minutes.
Allow brownies to cool for 15 minutes before removing from the pan.