1 yellow cake mix
4 eggs
2/3 c. oil
1 c. sour cream
1 c. brown sugar
3 tsp. cinnamon

Mix together cake mix, eggs, oil and sour cream. Put half of batter in a 9 x 13 inch pan. Mix together brown sugar and cinnamon. Sprinkle over batter. Cover with remaining batter and bake at 325 degrees for 45 to 55 minutes or until done. Mix:

3 c. powdered sugar
3/4 c. milk
2 tsp. vanilla

Mix together. While cake is hot, punch holes in it with fork and pour icing over.