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Whisk flour, cocoa powder, baking powder, baking soda, salt and 1/4 cup powdered sugar together in a large bowl
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In a separate bowl, whisk together brown sugar, eggs, vanilla extract, and beer
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Combine chopped chocolate and butter in a bowl and melt in microwave on 50% power, stirring every 30 - 45 seconds until melted and smooth - about 2 - 2 1/2 minutes total, let cool slightly
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Whisk the chocolate mixture into the egg/beer mixture
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Fold in flour mixture until combined
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Refrigerate at least 1/2 hour or overnight
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Preheat oven to 325 and line 2 baking sheets with parchment paper
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Put remaining 1/2 cup of powdered sugar and 1/2 cup granulated sugar into separate bowls
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Scoop dough out in roughly 2 tablespoon size balls
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Coat each ball with the granulated sugar then coat with powdered sugar then transfer to a baking sheet
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Bake 15 - 17 minutes, one sheet at a time rotating pan halfway through
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Let cool on baking sheet for 5 - 7 minutes then transfer to a wire rack to cool completely