Preheat your oven to 350 degrees. While that is warming up, melt your butter, 4 ounces of chocolate chips, and the unsweetened chocolate together in a microwave bowl. Set aside for 15 minutes to cool
In a large bowl, stir (DO NOT BEAT) together the eggs, coffee, vanilla, and sugar. Stir in the melted chocolate mixture and allow to cool to room temp.
Grab another bowl and sift together ¼ cup of flour, baking powder, salt, and chocolate mixture. Toss in the remaining ½ cup of chocolate chips and one tablespoon of flour. Add all of this to the chocolate mixture.
Spoon your mixture into your skillets and place them on a sheet pan & bake for 25 minutes.
Serve warm with some ice cream, chopped nuts on top, or however you best like your brownie.