1 box yellow cake mix
4 eggs
3/4 c. oil
1 carton sour cream
2 tbsp. cinnamon
1 c. brown sugar
1 c. raisins (optional)

ICING:

2 c. confectioners' sugar
4 tbsp. milk
1 tsp. vanilla

Grease and flour 13x9 baking pan. Combine first four ingredients. Pour thin layer of cake batter into pan. Combine next four ingredients and sprinkle evenly over layer of batter.

Then pour remaining cake batter over this. Swirl mixture slowly with knife. Bake at 325 degrees for 45 minutes. While cake is cooling, mix together ingredients for icing. When cake is cooled, spread icing over top.