Ribbon Coffee Cake

I occasionally treat my co-workers and this has become the most requested treat. Original recipe came from toh quick cooking.

In bowl combine cake mix , sour cream , eggs and oil.

Beat well.

Spread 1 / 2 of batter into greased 9x13 inch pan.

Combine brown sugar and cinnamon.

Sprinkle over batter.

Spread remaining batter over top.

Bake in preheated 350 degree oven for 30-35 minutes or until tests done.

Combine icing ingredients and drizzle over warm cake.

yellow cake mix, sour cream, eggs, vegetable oil, brown sugar, cinnamon, powdered sugar, milk, vanilla