Low-Fat Sweet Potato Crunch
["5 c. peeled, cubed sweet potatoes (2 lb.)", "1 c. unsweetened applesauce", "1 egg yolk", "1 tsp. vanilla extract", "1/2 tsp. ground cinnamon", "2 egg whites", "1/2 c. firmly packed brown sugar", "2 Tbsp. all-purpose flour", "1 Tbsp. margarine, melted"]
["Cook cubed sweet potatoes in boiling water for 15 minutes or until tender.", "Drain.", "Let cool.", "Position knife blade in food processor bowl.", "Add potatoes and applesauce; process until smooth.", "Add egg yolk, vanilla extract and cinnamon.", "Process until smooth; set aside in a bowl.", "Beat egg whites (room temperature) until stiff peaks form.", "Gently stir 1/3 of egg whites into sweet potato mixture, then gently fold in remaining egg whites.", "Spoon into 1 1/2-quart souffle dish coated with cooking spray.", "Combine sugar, flour and margarine and sprinkle over potato mixture.", "Bake at 350\u00b0", "for 35 minutes."]
["potatoes", "unsweetened applesauce", "egg yolk", "vanilla extract", "ground cinnamon", "egg whites", "brown sugar", "flour", "margarine"]