1Preheat oven to 350 degrees. Grease and flour 13x9 cake pan. Blend cake mix, eggs, oil and sour cream. Blend together for 4 mins.
Pour 1/2 of cake batter into pan. Set aside.
In a small bowl mix brown sugar & cinnimon then sprinkle over batter in pan.
Spread the remainder of the batter over the filling mixture and gently smooth it out.
Bake in oven for 30-40 mins.
2Mix together the Icing ingredients until smooth. When cake is cooled then pour Icing over cake, serve & enjoy.