Make the biscuits: Preheat oven to 450 degrees.

Combine the biscuit mix and the buttermilk in a large mixing bowl until a soft dough forms. Roll it out onto a floured surface and cut round biscuits with a 3" biscuit cutter or a drinking glass. Place them onto a cookie sheet and bake at 450 degrees for about 8 minutes until golden brown. Remove from heat and allow to cool slightly before serving.

Make the gravy: Heat a large skillet on high heat and add the sausage.  Cook until browned, about 7-10 minutes.  Remove from the skillet with a slotted spoon and transfer to a bowl that's lined with a paper towel.  Reserve the drippings, reduce the heat to medium, and add the butter and flour.  Stir until a soft roux is formed and stir in the milk.  Heat on medium heat and stir until a thick gravy forms.  Add the sausage back in, season with salt and pepper to taste, stir until combined.

To Serve: Place 2 biscuits on a serving plate.  Smother with gravy and serve!