Preheat oven to 425 degrees. Gather your ingredients so that you have everything close at hand on the counter or table.
In large bowl, combine the all-purpose flour, granulated sugar, baking powder, and salt. Cut in butter until mixture resembles coarse crumbs.
Add sourdough starter, and buttermilk, as needed. Mix with a blending fork until dough forms a ball.
Turn out onto a floured surface and knead 10-12 times. Pat the dough into a 3/4" thick circle. Cut with a biscuit cutter, dipped in flour.
Place on a baking sheet lined with parchment paper or a silicone baking mat in preheated oven. Bake for 12-17 minutes or until golden brown. Serve warm with butter. Makes 10-12 biscuits.
Notes
*Unless otherwise indicated, all butter on this recipe site is salted. **Depending on how thick or thin your sourdough starter is, use buttermilk as needed in order to get a nice dough.