Beat butter & sugar on high speed until light and fluffy. Next, add the eggs, one at a time. 

In a separate bowl, sift together flour and baking powder.

Add dry ingredients, vanilla and sour cream to the creamed butter mixture.

Spread half the batter into the bottom of a greased Bundt pan. 

Next, add cocoa powder to the remaining batter and spread on top of the plain batter. Use a knife to swirl the batters and create a marble effect.

Bake in 325°F oven for 50 to 60 minutes. 

In a small saucepan over low heat, combine butter, chocolate chips and milk. Cook just until melted. 

Stir in powdered sugar and mix well.  Frost cake and enjoy!

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