Double Chocolate Castella Cake: fluffy and very delicious

A very simple recipe to prepare a delicious chocolate cake.

Ingredients: 66g corn oil; 55g cake flour; 20g cocoa powder; 1/2 tsp baking powder; A pinch of salt; 5 egg yolks; 50g milk; 1/2 tsp vanilla;
5 egg whites; 75g sugar; 130g chopped chocolate chunks; whipped cream for decoration.

Directions: 

1)Preheat oven at 125°C

2)In a mixing bowl whisk together all dry ingredients from the first list with warm corn oil.

3)Add egg yolks, milk and vanilla to it and whisk it well.

4)In another bowl whisk egg whites while adding sugar gradually, until you get a firm mixture.

5)Now combine these two mixtures by adding gradually the white one to the black one.

6)Pour half of the dough in prepared dish, then sprinkle chopped chocolate chunks and at the top add the remaining dough. Tap a few times.

7)Water bake in the oven for 60 minutes.

8)When baked, tap the dish a few times, once again.

9)Serve with whipped cream.