1. Preheat oven to 350 degrees F (175 degrees C). 2. Grease a 2-quart casserole dish. 3. Heat olive oil in a skillet over medium heat; cook and stir Italian sausage until browned and crumbly, about 10 minutes. Use a slotted spoon to transfer sausage to prepared casserole dish. Drain drippings and reserve 2 tablespoons drippings in the skillet. 4. Melt 2 tablespoons margarine in a separate skillet over medium heat; cook and stir apple and onion slices until tender, about 8 minutes. Place apple and onion in casserole dish with sausage. 5. Lightly stir sausage, apple, and onion together; season with salt, black pepper, and oregano. 6. Brown flour in reserved drippings in skillet over medium heat. Whisk water into flour until thick gravy forms, about 3 minutes. 7. Pour gravy over sausage mixture in the casserole dish; spread mashed potatoes over the top with a spoon, creating peaks. Lightly brush mashed potatoes with 1 tablespoon melted margarine. 8. Bake in the preheated oven until the potatoes are lightly browned and the sausage mixture is bubbling, about 30 minutes. ---------------------------------------------------------------------------
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