Soak the oats and the raisins if you use them in the milk about 1 hour.
Preheat oven to 400°F - 200°C. Lightly grease a baking pan, set aside.
In a large mixing bowl combine the flour, the sugar and baking powder. In another mixing bowl beat egg whites, add the applesauce. Stir the egg whites mixture in the flour. Add the oat mixture. Mix well and add the walnuts ( optional ). Pour in the prepared baking pan.
Bake 30- 35 minutes. Cool 5 minutes and then turn onto a serving dish. Sprinkle with confectioners' sugar.