Marble cake by Haojie

 Ingredients:

300g   flour
300g   butter
300g    sugar
1 tablespoon  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
Then:
Add the flour and baking powder, mix well, divide the mixture in two. Mix the chocolate powder with half the mixture.
After:
pour the  chocolate mixture into a greased cake tin. Then add the rest of the mixture
Finally:
cook for 40 minutes at 180º.