Preheat oven to 350 degrees. Line a 9 x 9 or 8 x 8 pan with aluminum foil or parchment paper. Lightly spray with cooking spray or grease with butter. Set aside.Add butter to a medium saucepan and cook over medium heat until light brown / caramel in color. 5-10 minutes. Make sure to keep and eye on it so butter does not burn. It also helps to use a light colored saucepan for this.
Pour browned butter into a large bowl along with both sugars, cocoa powder, salt, instant coffee granules and baking powder. Stir until combined and allow to rest for 5 minutes or until the mixture has cooled down.
Stir in the eggs and vanilla and mix until batter has a nice sheen to it.
Fold in the flour and chocolate chunks or chips and stir until combined. (Do not over mix)
Pour the batter into the prepared pan and bake for 20-25 minutes or until the top is set and a toothpick comes out clean.
Cool completely and lift out the aluminum foil or parchment paper.Frost with peanut butter frosting and drizzle with melted chocolate.
Cut into 9 brownies and serve.
Peanut Butter Frosting
In a stand mixer with the paddle attachment cream butter and peanut butter until light and fluffy, 2-3 minutes.
Add in powdered sugar, milk and vanilla and mix until smooth and lump free.
Set aside until you are ready to frost your brownies.
Chocolate Drizzle
Melt chocolate in a small saucepan or in the microwave in 15 second intervals until melted.Pour the chocolate into a small ziplock bag and cut a small snip in the corner off of the bag.Set aside until you are ready to drizzle your brownies.