Preheat the oven to 350F and line an 8x8 glass baking dish with parchment paper (you could also grease the dish with coconut oil instead of using parchment paper).
In a double boiler (or microwave) melt together the butter and 1 1/2 cups chocolate chips (you're saving 1/2 cup for later). Do this until smooth and all the butter and chocolate is melted. If you're using the microwave only heat in 30 second intervals and stir in between each interval.
Turn the heat off, remove the bowl from the double boiler, and add both sugars, vanilla, and ground epsresso beans and stir.
In a separate bowl, whisk then eggs vigorously for about 1 minute until tons of bubbles form on top. Seriously, whisk like crazy! Then add the eggs to the batter and stir well.
Add the flour, baking powder and cocoa powder then stir until just combined.
Fold in the last 1/2 cup of chocolate chips to the batter.
Pour the batter into the prepared baking dish and bake for about 30 minutes. Note, the toothpick trick doesn't work for fudgy brownies. See tip below on how to tell when these are done.