Crumble the sausage in a heavy sauce pan or large skillet. (A good-size cast iron skillet works well).
Once the sausage is browned, sprinkle the flour over the sausage and stir until flour is absorbed. Pour the milk in (a little at a time) and continue adding as it begins to thicken. Cook until the consistency of thick, creamy gravy. Taste to see if it needs salt or pepper.