200 g butter (room temperature)
2 spoons of vegetable oil
Preheat the oven to 180°C.
Mix the cake mix with the eggs and vegetable oil in a bowl until you have a nice, smooth batter.
Mix for 1 minute at low speed, add the butter (at room temperature).
Mix for a further 5 minutes at medium speed.
Spray the desired baking tin with baking spray.
Divide the batter into a baking tin of your choice and make sure the tin is 3/4 full.
Bake the cake for 50 to 55 minutes in the centre of the preheated oven.
Pierce the middle of the cake (at the end of the baking time) with a thin awl, when there is no more batter, the cake is cooked.
Otherwise extend the baking time by 5 minutes.
After baking, remove the cake from the baking tin and let it cool down on a wire rack.