Preheat the oven to 350 degrees.
Line a 8x8 pan with parchment paper.
In a medium microwave-safe bowl, combine the dark and semi-sweet chocolate, the butter, and the coffee granules.
Cover loosely & microwave 30 seconds, stir & microwave another 15 seconds more to melt the butter & chocolate.
Add sugars, stir until completely dissolved. Let the mixture cool to room temperature.
Add in eggs.
Fold in flour, cocoa, salt, & vanilla just until all white streaks are gone.
Pour into the prepared pan.
Bake 28-30 minutes or until toothpick test is clean.
In the last 10 minutes of baking - remove brownies & add your pieces of white chocolate & return to oven to melt slightly.
Allow to cool before cutting.
Dust with confectioners sugar before serving.