Preheat the oven to 350°F.
Add the butter, powdered sugar, sugar, salt, and vanilla extract to the bowl of a stand mixer. Beat on high until well combined.
Stir in the flour until just combined.
Line an 8X8 pan with parchment paper.
Press about ¾ of the mixture into the bottom of the pan in an even layer.
In a separate bowl stir together the berries, sugar, cornstarch, and beer.
Add the berry mixture in an even layer to the pan.
Crumble the remaining crust on top of the berry layer.
Bake until the top is golden brown, 55-65 minutes.
Allow to cool completely before cutting, the filling will set as it cools.