Mix the eggs with the icing sugar until creamy, stir in the oil and stir briefly, then gradually stir in the other ingredients. Finally quarter the Ferrero balls and add them to the batter.
Spread the dough in a prepared small box shape (22 x 9) and bake in a preheated oven at 155 ° for about 45 minutes (test with a stick).
Once cooled, pour any glaze over the cake and top with Ferreros if necessary.