Peel and chop the apples into small pieces and keep aside.
In a deep bowl beat the eggs with sugar and keep aside Mix baking powder and 4 tsp of cinnamon powder with the flour.
Gradually mix the powdered mixture into the beaten eggs.
Mix in oil, apples and walnuts with it. Pour the mixture into the baking dish.
Sprinkle the rest of the cinnamon powder on top.
Bake for one hour or till done. Serve. (The cake keeps for 6-7 days in a cool place.)