In a medium bowl stir together the cocoa powder and baking soda. Add half the butter and mix well.
Add the hot coffee. Stir until the mixture thickens.
Add the remaining butter, vanilla, eggs, and chocolate chips. Mix well. Now, add the dry ingredients.
Mix until smooth.
Spread in the prepared pan. Bake for 30-35 minutes until the center only jiggles slightly.
Cool completely.
Notes
For the fudgiest brownies cool completely and then refrigerate overnight. If you like your brownies warm reheat them after they have been completely cold.