Marble cake by Zeña

Ingredients:
300g flour 
300g butter
300g sugar
1tablespoon baking powder
4 eggs
150g chocolate powder
Method:
First: Mix the sugar and the eggs in a big bowl. Add the softened butter and mix well.
Next: Add the flour and baking powder. Mix well. Divide the mixture in two. Mix the chocolate powder with half the mixture.
Later: Pour the chocolate mixture intro a greased cake tin. Then add the rest of the mixture .
Finally: Cook for 40 minutes at 180*c.