Preheat oven to 325 degrees.
Place shredded sweet potatoes in large bowl.
Add egg whites, salt, pepper, onion powder and garlic powder. Mix.
In 9x13 greased pan, pour in the sweet potato mixture and spread evenly.
Sprinkle turkey breakfast sausage crumbles on top of sweet potato mixture.
Sprinkle with shredded cheese.
Bake for 25-30 minutes or until center of casserole is done.
