Preheat the oven to 350 degrees.
Melt the butter, 4 ounces of chocolate chips, and the unsweetened chocolate together in a medium bowl set over simmering water. Set aside for 15 minutes. In a large bowl, stir (do not beat) together the eggs, coffee, vanilla and sugar. Stir the chocolate mixture into the egg mixture and allow to cool to room temperature.
In a medium bowl, sift together 1/4 cup of the flour, the baking powder and salt and add to the chocolate mixture. Toss together the remaining 1/2 cup of chocolate chips and one tablespoon of flour in a medium bowl and add them to the chocolate mixture. Spoon the mixture into five 3 1/2 inch cast iron skillets and place them on a sheet pan. Bake for 25 minutes. Don't over bake!
Serve warm with a scoop of ice cream on top.