Preheat oven to 450°F (230°C). In a large bowl, whisk together 2 cups flour, baking powder, and 1 tsp salt.

Cut in cold butter using a pastry cutter or fingers until mixture resembles coarse crumbs. Stir in buttermilk until just combined.

Turn dough onto a floured surface, knead lightly, and pat into a 1-inch thick rectangle. Cut into 8 biscuits using a round cutter.

Place biscuits on a baking sheet and bake for 12-15 minutes until golden brown. Let cool slightly.

Meanwhile, cook sausage in a skillet over medium heat, breaking it into crumbles until browned. Do not drain fat.

Sprinkle 1/4 cup flour over sausage, stirring for 1-2 minutes to cook the flour. Gradually whisk in milk until smooth.

Simmer gravy for 5-7 minutes, stirring frequently, until thickened. Season with black pepper, salt, and red pepper flakes.

Split warm biscuits in half and smother with sausage gravy. Serve immediately.