Step 1

Preheat oven to 450 degrees F. Line a baking sheet with parchment paper or a silicone baking mat.

Step 2

In a large bowl, combine flour, sugar, baking powder, salt and baking soda.

Step 3

Grate butter using the large holes of a box grater. Stir into the flour mixture.

Step 4

In a medium bowl, whisk together sourdough starter and buttermilk. Add to the flour mixture and stir using a rubber spatula until a soft dough forms.

Step 5

Working on a lightly floured surface, knead the dough 2-3 times until it comes together. Using a rolling pin, roll the dough into a 1 1/2-inch thick rectangle. Cut out 8-10 rounds using a 2-inch biscuit or cookie cutter.

Step 6

Place biscuits onto the prepared baking sheet. Place into oven and bake for 14-18 minutes, or until golden brown.

Step 7

Serve warm.