Shaping the dough directly on the baking sheet makes short work of homemade biscuits. Serve these biscuits warm with butter.
Heat oven to 425 degrees. Combine flour, salt, sugar, baking soda, and powder in the bowl of a food processor. Pulse once or twice to combine. Add butter, and process until dough looks like coarse oatmeal. Add buttermilk, and process a few seconds more, until dough just comes together.
Turn out dough onto a parchment-lined baking sheet, and pat into a 7-inch circle about 1 inch thick. Using a sharp knife, cut into 8 wedges, but do not separate.
Bake biscuits until golden brown on top and firm, about 20 to 25 minutes. Serve warm with butter.