In a large microwave safe-bowl, add butter and melt in the microwave.
Stir in granulated sugar and brown sugar and melt again for 30 seconds OR until the sugar and butter start to bubble slightly. Make sure not to burn this mixture.
Place this saucepan in the freezer for 10 minutes so as to cool the mixture slightly.
Then, add brewed coffee, espresso powder, eggs, and mix until smooth.
Add flour and mix until just combined.
Stir in chocolate chips and walnuts.
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!