In a large saucepan over medium heat, melt the unsalted butter. Once melted, remove it from the heat and stir in the granulated sugar and light brown sugar until well combined.

Add Eggs and Vanilla

Add the large eggs, one at a time, to the butter and sugar mixture, stirring well after each addition. Then, mix in the vanilla extract.

Mix Dry Ingredients

In a separate bowl, whisk together the all-purpose flour, unsweetened cocoa powder, baking powder, and salt.

Combine Mixtures

Gradually add the dry ingredients to the wet mixture, stirring until just combined. Do not overmix.

Add Beer and Chocolate Chips

Slowly stir in the dark beer until evenly mixed, then fold in the semi-sweet chocolate chips.

Bake the Brownies

Pour the brownie batter into the prepared baking pan and spread it evenly. Bake in the preheated oven for about 25-30 minutes or until a toothpick inserted into the center comes out with a few moist crumbs.

Cool and Dust with Powdered Sugar

Once baked, remove the brownies from the oven and let them cool in the pan for about 15 minutes. Then, transfer to a wire rack to cool completely. Before serving, dust the top with powdered sugar.