Preheat your oven to 450°F (230°C).
In a large mixing bowl, combine the flour, baking powder, and salt.
Cut in the cold butter until the mixture resembles coarse crumbs.
Pour in the buttermilk and stir until just combined.
Turn the dough out onto a floured surface and knead gently.
Roll out the dough to about 1 inch thick and cut into biscuits.
Place the biscuits on a baking sheet and bake for 12-15 minutes until golden brown.
In a skillet, cook the breakfast sausage over medium heat until browned and crumbled.
Sprinkle the additional flour over the browned sausage and stir to combine.
Gradually whisk in the milk, stirring constantly until the mixture thickens.
Season the gravy with black pepper and cayenne (if using).
Serve the biscuits warm, topped generously with sausage gravy.