Marble cake chocolate with dark and white chocolate

ingredients:
For 6-8 people:
100g dark chocolate 
100g white chocolate Pastry
85g of sugar
2 x 35g of butter
150g flour
4 eggs
1 teaspoon baking powder
4 tbsp cheese
For the icing:
100g dark chocolate 
50g butter
method:


1 - Melt separately in a bath the  two chocolates with each 35g of butter.
2 - Meanwhile, in a bowl mix the flour, yeast, sugar, cream cheese, 2 eggs and 2 egg yolks (keep the whites in a bowl 2 apart ) .
3 - Whisk to a smooth paste . Divide the dough in half.
4 - Pour in half the chocolate mixture black / butter. Mix .
5 - Pour in the other half chocolate / butter mixture white. Mix .
6 - Mount Snow in the two remaining egg whites .
7 - Pour the dough in half dark chocolate and half in white chocolate dough . Mix gently.
8 - In a pan missing , divide both chocolate pasta. You can mix to get a marbled mixture but be careful not to merge the two pastes together.
9 - Preheat your oven to 180 ° C and bake for 30-40 min.
10 - Let cool before unmolding.
11 - Prepare the glaze : Melt the chocolate bath .
12 - Add the butter in pieces and mix until well blended.
13 - Pour the warm glaze over .
http://www.chefnini.com/gateau-marbre-chocolat-noir-blanc/