Spray a small casserole dish with cooking spray. I used a 7×10.
Slice biscuits into quarters. Layer half the biscuits in the bottom of the casserole dish.
Bake in a preheated oven, 400, for about 10 minutes.
While biscuits are cooking, cook the breakfast sausage in a pan over medium heat. Cook until no longer pink.
Drain fat and sprinkle the flour on top of meat.
Stir until the flour is completely absorbed.
Add the milk, salt, and pepper, and stir until combined.
Allow mixture to come to a slow boil. Add more seasonings if desired. You want the gravy to be thick, but not too thick, so add a bit more milk if needed.
Pour gravy over cooked biscuits and layer remaining biscuit dough on top.
Place dish into the oven and bake for about 25 minutes, or until golden brown.