1 box butter cake mix
4 eggs
3/4 c. oil
1 (8 oz.) sour cream

Mix and pour half of batter into long pan:

1 c. brown sugar
3 tsp. cinnamon

Mix and sprinkle half over batter. Pour other half of batter over that and sprinkle other half of brown sugar and cinnamon. Swirl with knife and bake 45 minutes at 325 degrees

1 box powdered sugar
1 tsp. vanilla

Add just enough milk to mix and pour. Spread over cake while still hot.