1cupchocolate chunksor one 4-ounce chocolate bar broken into bits
Instructions
Preheat the oven to 350 degrees Fahrenheit.
Combine the brownie mix and espresso powder in a large bowl.
Add the water, vegetable oil, and egg into the brownie mix and stir until combined.
Next, pour the brownie batter into a prepared 9x9 baking dish.
Drop dollops of marshmallow fluff onto the brownie batter.
Then, using a knife, draw it through the mix to create a swirl pattern in the brownies.
Finally, sprinkle the chopped walnuts and chocolate chunks over the top the of the brownie mix.
Bake for approximately 40-45 minutes or until a toothpick comes out clean (baking time will vary based on the size of the dish, refer to the brownie box instructions for exact time).