Preheat overn to 350. Mash potatoes until smooth and add to rest of the main ingredients. Can be mixed in a food processor. Turn into souffle dish or 2 qt shallow baking pan. Top with crunchy topping. TOPPING: mix brown sugar, melted butter and crushed cornflakes. Toss until well coated. Sprinkle over sweet potato mixture. Bake uncovered for 30 minutes or until topping is brown and crisp. Serves 8 -10.