Preparing the Biscuits:
Preheat your oven to 450°F (230°C).
In a large mixing bowl, whisk together the flour, baking powder, sugar, and salt until well combined.
Add the cold, cubed butter to the dry ingredients. Using a pastry cutter or your fingers, cut the butter into the flour until the mixture resembles coarse crumbs.
Pour in the cold buttermilk and stir until just combined. Be cautious not to overmix; the dough should be slightly sticky.
Turn the dough out onto a floured surface and gently knead it a few times. Pat or roll the dough to about 1/2-inch thickness.
Using a round biscuit cutter, cut out biscuits and place them on a baking sheet, ensuring they are close but not touching.
Bake for 10-12 minutes or until the biscuits are golden brown on top.
Cooking the Sausage Gravy:
In a large skillet over medium heat, cook the ground pork sausage. Break it apart with a spatula and cook until browned and cooked through.
Sprinkle flour over the cooked sausage and stir well, ensuring the flour is fully incorporated.
Gradually pour in the whole milk, stirring constantly to avoid lumps. Continue stirring until the mixture thickens, usually around 5-7 minutes.
Season the gravy with salt and black pepper to taste. Remember, the sausage adds some saltiness, so adjust accordingly.
Serving:
Split the warm biscuits in half and place them on serving plates.
Ladle the hot sausage gravy generously over each biscuit half.
Serve immediately and enjoy your delicious Southern Biscuits and Gravy!