In a large mixing bowl, add butter, granulated sugar and brown sugar.
Mix until combined.
Then, add brewed coffee, espresso powder, eggs, and mix until smooth.
Add flour, chocolate chips, walnuts (if using) and mix until combined.
Pour this batter in a square cake pan (Dimensions: 9x9x2), lined with foil paper and sprayed with oil.
Bake at 350 degrees F for 25-28 minutes or until an inserted toothpick in the center comes out with a few sticky crumbs. If it comes out dry, you have over-baked your brownies.
Allow the brownies to cool while you prepare the coffee glaze.
In a small mixing bowl, mix together the brewed coffee, cocoa powder and powdered sugar until glaze is thick and smooth.
Use a sharp knife to cut square shaped brownie slices.
Spread a little glaze on top of each piece and toss sprinkles. Enjoy!