Shape leftover dressing into patties. If dressing is moist, you won't need to add anything--they should shape right up easily. If they are too dry to hold together, beat in an egg or a little milk.
Coat the patties in flour. Heat butter or oil in a large skillet and add the patties, one at a time. Cook on one side over medium heat, about five or ten minutes. Turn patties once and cook on other side.
When golden brown, remove to a paper towel to drain.
Serve plain or with leftover gravy.