Preheat oven to 400 degrees. Mix egg whites, sugar and 1/4 cup milk in medium-sized mixing bowl. In seperate bowl, mix flour, baking powder, salt and 2 teaspoons cinnamon. Gradually stir into egg mixture to form a soft dough that can be handled. Pat dough into a 9" or 10" nonstick cake pan, covering botton and sides. Peel and slice apples. Arrange them in overlapping slices. Mix brown sugar, milk and cinnamon and drizzle over the apples. Bake 20 minutes. Serve warm.