Cook the sweet potatoes in a pot with the water to cover until soft. Drain well. Add the remaining topping ingredients and mash to a smooth, fluffy consistency. Set aside.
Spray a 13 by 9-inch baking dish with vegetable spray. In a food processor with a steel blade, finely chop the onion, garlic and carrots for about 8 seconds. In a large pot on stove, heat olive oil and saute onion, garlic and carrots until just soft. Add meat and brown for 6-8 minutes, stirring. Combine egg whites with ketchup and add with salt, pepper, basil and oregano to meat mixture, mixing well. Spread meat mixture in casserole. Place sweet potato mixture on top. Garnish with paprika. Bake uncovered in preheated 350 degree oven for 50-60 minutes until potatoes are golden on top. Can be prepared a few days in advance and refrigerated until ready to reheat and serve.
Freezes very well. 10-12 servings.

