Preheat oven to 425 degrees

In a medium mixing bowl, mix together flour, salt, and baking powder

Using a cheese grater, grate the butter into the bowl

With your hands, mash the mixture together until uneven lumps form

Add the sourdough starter and keep mixing with your hands until a somewhat dry dough forms

On a lightly floured parchment lined surface (counter or cutting board work well), press the dough into a large round, about 1 inch thick. No need to use a rolling pin

Using a knife or circular mold (even a cup or mug will work), make dough into eight biscuits and place on a greased or nonstick baking sheet

Bake for 22 minutes until the tops and edges start to turn golden

Serve warm or let cool and store at room temperature on a covered plate or in a container. Should last for a couple days. Or freeze them!