Beat further to dissolve and slowly add the milk and oil. Again, while continuously beating, gradually add the flour with the other ingredients.
The mixture is ready when it starts to bubble. Grease a baking tray, sprinkle it with flour evenly and pour 1/3 of the mixture in.
Bake the cake layer in a preheated oven for about 20 minutes at 356°F (180 °C). Remove and bake the two others the same way.