Filling
Topping
In a mixer, put the eggs and the refined sugar, whip until it all combines and a lighter colored mixture is formed. Add the oil and keep whipping, gradually add the milk while whipping.
Mix the wheat flour with the milk powder and gradually add this mixture to the mixer.
Grease a baking tin with butter and flour, pour the batter in it and bake in a preheated oven at 180°C (356°F) for 45 minutes (do the toothpick test).
To make the filling, put the condensed milk in a pan and add the corn starch, mix them very well until combined. Add the table cream, the milk powder, mix with the heat turned off. Turn the heat on at medium power, add the butter and stir nonstop until it thickens.
Unmold the cake, cut it in half horizontally, moist this half in a mixture of milk and condensed milk, pour the chilled filling and spread evenly. Cover it with the other half of the cake, and with a fork or knife, poke small holes all over it and moisten it with the mixture of milk and condensed milk. Cover the cake with a plastic bag and chill in the fridge for at least 4 hours.
To make the topping, in a mixer add the condensed milk, the table cream, the milk powder and the butter, and beat it all together until combined. Spread this mixture all over the cake.
Chill in the fridge for 30 minutes.
Finish by sprinkling milk powder all over the cake.
Serve.