Preheat oven to 180ºC . Heat oil in a large skillet over medium heat. Add onions, celery, carrot & seasonings. Cook for 7 minutes till vegetables are tender. In an 8 X 30 cm baking dish, alternate layers of gravy, potatoes & sauteed vegetables. Repeat. Top with the rest of the gravy. Sprinkle on paprika & nutritional yeast. Bake for 20 minutes. "The Cookbook for People Who Love Animals"