Chocolate cake of only a few ingredients with a juicy biscuit that does not need to be soaked

The recipe is on spoons for quick and easy preparation
Ingredients
10jaja
13 tablespoons sugar
6 tablespoons flour
4 tablespoons cocoa
200ml oil
750ml of milk
3 chocolate puddings
170g vanilla flavored margarine
500g nutella
for decoration 3 bags of chocolate whipped cream