BATTER:

1 box butter cake mix (Duncan Hines)
4 eggs
8 oz. sour cream

FILLING:

1 c. brown sugar
3 tsp. cinnamon

ICING:

2 c. powdered sugar
4 tbsp. water
1 tsp. vanilla

Mix batter and pour 1/2 into greased 9 x 13 inch pan. Sprinkle 1/2 filling over batter in pan. Pour remaining batter into pan. Sprinkle remaining filling over batter. Bake at 350 degrees for 30 minutes. Put icing over hot cake.