Whisk eggs and sugar until light and creamy

Add milk, oil, vanilla extract and mix well

Sift the flour and salt and add to the mixture

Mix well. Divide the batter in two, add cocoa in one and mix well

In a greased / lined pan place 2 spoonfull of chocolate batter in the middle. Then in the middle of the chocolate batter place 2 spoonfull of vanilla batter. Alternate until all the batter are used.

Bake in a preheated oven at 350 degrees C for 35-40 mins