1. Combine apples with cinnamon and sugar.
2. Beat egg whites and sugar until stiff. Set aside.
3. Mix yolks and remaining ingredients. Combine with egg whites.
4. Pour half of batter into two 10- by 16-inch pans. Spread half of apples over batter. Pour remaining batter over apples and top with remaining apples.
5. Bake for one hour.
6. Cut into 2 and 1/2- to 3-inch squares. Dust with confectioners’ sugar.
7. Preheat oven to 350 degrees Fahrenheit.