Mix dry ingredients for the biscuits in a large bowl.
Add chunks of cold butter to the dry ingredients. Cut butter into flour. I usually use my hands to massage the flour and butter together until it starts to form a ball. You can also use a food processor or pastry blender.
Add sourdough starter, sugar, milk or buttermilk.
Stir until nicely incorporated and creates a dough.
Roll out dough onto a lightly floured surface and cut biscuits.
Place onto a parchment paper lined baking sheet.
Bake biscuits in a 400 degree oven for 14 -20 minutes.
While the biscuits are baking, brown sausage over medium heat.
Reduce the heat to medium-low. Sprinkle on the flour and stir so that the sausage grease soaks it all up.
Cook for a few more minutes.
Pour in the milk and stir constantly.
Cook the gravy, stirring frequently, until it thickens. This takes about 5-10 minutes.
Add in the salt and pepper and stir. If the gravy gets too thick, add a little more milk.
