Preheat your oven to 425°F and grease your waffle iron.
Prepare the skillet on medium heat for the sausage.
In a bowl, combine flour, baking powder, baking soda, and salt.
Cut in the butter using a pastry cutter until the mixture resembles coarse crumbs.
Add the buttermilk gradually while mixing until a dough forms.
Avoid overmixing to keep the biscuits tender.
On a floured surface, knead the dough gently and roll it out to a 1-inch thickness.
Cut into rounds and place on a baking sheet or directly in the waffle iron.
Cook the sausage in a skillet until browned.
Sprinkle flour over the sausage and stir until it absorbs the fat.
Slowly add milk to the sausage mixture, constantly stirring until the gravy thickens.
Season with salt and pepper to taste.
Cook the biscuits for about 8-10 minutes in the oven, or until golden brown, then pour the gravy over the biscuits and serve.