Preheat oven to 425F.
Add the flour, salt, baking powder, cheddar and rosemary to a food processor, pulse to combine.
While the food processor is running, add the butter cubes one at a time until well combined with the flour. Add the sour cream and beer, pulse until just combined.
Add the dough to a floured surface (it will be soft), gently pat into a circle about 1 inch high. Cut into 8 wedges.
Add the wedges to a baking sheet, top with remaining cheddar and rosemary.
Bake for 12 minutes or until the edges are just starting to turn golden brown. Serve warm.