1 box white cake mix
4 eggs
3/4 c. vegetable oil
1 (8 oz.) carton sour cream
1 c. brown sugar
2 tsp. cinnamon
2 c. powdered sugar
1 tsp. vanilla
3 tbsp. milk

In large mixing bowl combine cake mix, eggs, oil, and sour cream following cake mix package directions. Pour half of mixture into a greased 9 x 13 inch baking pan. Mix brown sugar and cinnamon; sprinkle over batter. Pour remaining batter on top. Bake at 350 degrees for 30 minutes or until done. Mix powdered sugar, vanilla, and milk. Spread over hot cake.