Guinness Brownies

0 Preheat the oven to 350°F. Line a 9"x9" square baking pan parchment paper and spray with cooking spray (or forgo the parchment paper, and butter and flour the dish.) Set aside.
1 Combine [adjustable]¾ cup[/adjustable] of dark chocolate chunks and the butter in a heat-safe bowl. Heat the mixture in the ingredients in 30-second increments in the microwave, removing the bowl and stirring after each session. You could also do this in a small saucepan on the stovetop over medium heat, which is what I did for the photographs. Melt the butter first, then add the chocolate chips and stir until melted.
2 Once all the chocolate is melted, measure in the granulated sugar, and stir vigorously until combined. You want the mixture to be smooth and to not see or feel any sugar granules anymore.
12 Pour in the vanilla extract, and stir to combine. Set aside so that the chocolate mixture can cool slightly.
3 Crack the eggs in a large bowl, and break the yolks using a fork or a whisk. Measure in the brown sugar, and whisk vigorously until combined. The brown sugar should be dissolved into the egg mixture.
13 Pour the slightly cooled chocolate mixture slowly into the egg mixture, whisking as you do this to combine the ingredients together. Stir until everything is incorporated.
4 In a medium-sized bowl, combine the flour, cocoa powder and salt. Whisk to combine.
5 Sprinkle the dry ingredients into the wet ingredients, and stir before pouring in the Guinness. Stir until there are no longer lumps, and the mixture is well combined.
6 Add the remaining chocolate chips, and stir to combine. 
11 Pour the brownie batter into the prepared baking dish and transfer to the preheated oven.
7 Bake for 35-40 minutes, or until the edges are firm and an inserted toothpick comes out clean.
14 Let the brownies cool before sprinkling with powdered sugar or frosting them, slicing and serving.
10 Enjoy with a glass of milk... or a pint of Guinness.