The Best Marble Cake

Directions

1. 1
   Preheat oven to 375.
2. 2
   Spray Bundt cake with non-stick.
3. 3
   Microwave chocolate with 20-30 sec intervals. Stir and repeat until most of the chocolate is melt but not all (usually takes 1 minute). I usually do not let it melt completely, which creates a nice effect in the cake.
4. 4
   Combine cake mix, eggs, vanilla extract, sour cream, vegetable oil, sugar and water. Beat on high for around 3 minutes.
5. 5
   Stir third of the batter into the melted chocolate, mix well.
6. 6
   Spread half of the vanilla batter in the pan, then the chocolate batter and then the rest of the vanilla batter. Swirl the batters with a butter knife to create the marble effect.
7. 7
   Bake for 35-40 minutes, cool for 20 minutes in pan, remove from pan and cool completely.
8. 8
   For the icing: melt the chocolate and butter (you can do this in the microwave as well, but be careful).
9. 9
   Cool the mix for 5-10 minutes, add sour cream and then the powdered sugar 1 cup at a time.
10. 10
    Spread the icing on the cake when it has cooled completely.