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1
Preheat oven to 375.
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2
Spray Bundt cake with non-stick.
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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.
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4
Combine cake mix, eggs, vanilla extract, sour cream, vegetable oil, sugar and water. Beat on high for around 3 minutes.
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5
Stir third of the batter into the melted chocolate, mix well.
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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.
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7
Bake for 35-40 minutes, cool for 20 minutes in pan, remove from pan and cool completely.
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8
For the icing: melt the chocolate and butter (you can do this in the microwave as well, but be careful).
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9
Cool the mix for 5-10 minutes, add sour cream and then the powdered sugar 1 cup at a time.
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10
Spread the icing on the cake when it has cooled completely.
