Preheat the oven to 400° F. Grease a sheet pan or line with parchment paper and set to the side. In a bowl, combine flour, sugar, salt, cayenne pepper and baking powder. In a separate bowl, whisk the beer and sriracha sauce together. Pour sriracha beer mixture and melted butter into the dry mixture and stir to combine. Scoop out dough in ¹/₂ C. portions onto prepared sheet pan and bake at 400° F. for 15-20 minutes or until golden brown.